diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 2b14f37..7bfe306 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -7,6 +7,9 @@ variables:
   DOCKER_DRIVER: overlay
   DOCKERFILE: Dockerfile
 
+before_script:
+  - sh version.sh > senpy/VERSION
+
 stages:
   - test
   - images
diff --git a/Dockerfile-3.4 b/Dockerfile-3.4
index c631112..118230d 100644
--- a/Dockerfile-3.4
+++ b/Dockerfile-3.4
@@ -1,10 +1,13 @@
-from python:3.4-slim
+from python:3.4
+
+RUN mkdir /cache/
+ENV PIP_CACHE_DIR=/cache/
 
 WORKDIR /usr/src/app
 ADD requirements.txt /usr/src/app/
 RUN pip install --use-wheel -r requirements.txt
 ADD . /usr/src/app/
-RUN pip install --use-wheel .
+RUN pip install .
 
 
 VOLUME /data/
@@ -13,6 +16,6 @@ RUN mkdir /senpy-plugins/
 
 WORKDIR /senpy-plugins/
 ONBUILD ADD . /senpy-plugins/
-ONBUILD RUN python -m senpy -f /senpy-plugins
+ONBUILD RUN python -m senpy --only-install -f /senpy-plugins
 
 ENTRYPOINT ["python", "-m", "senpy", "-f", "/senpy-plugins/", "--host", "0.0.0.0"]
\ No newline at end of file
diff --git a/Dockerfile-3.5 b/Dockerfile-3.5
index 1899c5b..314cc0d 100644
--- a/Dockerfile-3.5
+++ b/Dockerfile-3.5
@@ -1,4 +1,4 @@
-from python:3.5
+FROM python:3.5
 
 RUN mkdir /cache/
 ENV PIP_CACHE_DIR=/cache/
diff --git a/Makefile b/Makefile
index fb6e75d..7b6076b 100644
--- a/Makefile
+++ b/Makefile
@@ -2,13 +2,19 @@ PYVERSIONS=3.5 3.4 2.7
 PYMAIN=$(firstword $(PYVERSIONS))
 NAME=senpy
 REPO=gsiupm
-VERSION=$(shell git describe --tags)
-TARNAME=$(NAME)-$(subst -,.,$(VERSION)).tar.gz 
+VERSION=$(shell ./version.sh)
+TARNAME=$(NAME)-$(VERSION).tar.gz 
 IMAGENAME=$(REPO)/$(NAME):$(VERSION)
 TEST_COMMAND=gitlab-runner exec docker --cache-dir=/tmp/gitlabrunner --docker-volumes /tmp/gitlabrunner:/tmp/gitlabrunner --env CI_PROJECT_NAME=$(NAME)
 
 all: build run
 
+FORCE:
+
+version: FORCE
+	@echo $(VERSION) > $(NAME)/VERSION
+	@echo $(NAME) $(VERSION)
+
 yapf:
 	yapf -i -r senpy
 	yapf -i -r tests
@@ -36,7 +42,13 @@ quick_test: $(addprefix test-,$(PYMAIN))
 test: $(addprefix test-,$(PYVERSIONS))
 
 debug-%:
-	(docker start $(NAME)-debug && docker attach $(NAME)-debug) || docker run -w /usr/src/app/ -v $$PWD:/usr/src/app --entrypoint=/bin/bash -ti --name $(NAME)-debug '$(IMAGENAME)-python$* pip install -r test-requirements.txt'
+	@docker start $(NAME)-debug || (\
+		$(MAKE) build-$*; \
+		docker run -d -w /usr/src/app/ -v $$PWD:/usr/src/app --entrypoint=/bin/bash -p 5000:5000 -ti --name $(NAME)-debug '$(IMAGENAME)-python$*'; \
+		docker exec -ti $(NAME)-debug pip install -r test-requirements.txt; \
+	)\
+
+	docker attach $(NAME)-debug
 
 debug: debug-$(PYMAIN)
 
@@ -77,7 +89,9 @@ pip_upload:
 
 pip_test: $(addprefix pip_test-,$(PYVERSIONS))
 
-run: build
-	docker run --rm -p 5000:5000 -ti '$(IMAGENAME)-python$(PYMAIN)'
+run-%: build-%
+	docker run --rm -p 5000:5000 -ti '$(IMAGENAME)-python$(PYMAIN)' --default-plugins
+
+run: run-$(PYMAIN)
 
 .PHONY: test test-% build-% build test pip_test run yapf dev
diff --git a/docs/examples/results/example-complete.json b/docs/examples/results/example-complete.json
index 53d105b..d735e6e 100644
--- a/docs/examples/results/example-complete.json
+++ b/docs/examples/results/example-complete.json
@@ -53,7 +53,8 @@
           "@id": "http://micro.blog/status1#char=16,77",
           "nif:beginIndex": 16,
           "nif:endIndex": 77,
-          "nif:anchorOf": "put your Windows Phone on your newest #open technology program"
+          "nif:anchorOf": "put your Windows Phone on your newest #open technology program",
+          "prov:wasGeneratedBy": "me:SgAnalysis1"
         }
       ],
       "sentiments": [
diff --git a/docs/examples/results/example-suggestion.json b/docs/examples/results/example-suggestion.json
index 2ba943a..be585bb 100644
--- a/docs/examples/results/example-suggestion.json
+++ b/docs/examples/results/example-suggestion.json
@@ -24,7 +24,8 @@
           "@id": "http://micro.blog/status1#char=16,77",
           "nif:beginIndex": 16,
           "nif:endIndex": 77,
-          "nif:anchorOf": "put your Windows Phone on your newest #open technology program"
+          "nif:anchorOf": "put your Windows Phone on your newest #open technology program",
+          "prov:wasGeneratedBy": "me:SgAnalysis1"
         }
       ],
       "sentiments": [
diff --git a/docs/plugins.rst b/docs/plugins.rst
index ec04a3b..91308f5 100644
--- a/docs/plugins.rst
+++ b/docs/plugins.rst
@@ -2,46 +2,127 @@ Developing new plugins
 ----------------------
 Each plugin represents a different analysis process.There are two types of files that are needed by senpy for loading a plugin:
 
-Plugins Interface
-=======
 - Definition file, has the ".senpy" extension.
 - Code file, is a python file.
 
+This separation will allow us to deploy plugins that use the same code but employ different parameters.
+For instance, one could use the same classifier and processing in several plugins, but train with different datasets.
+This scenario is particularly useful for evaluation purposes.
+
+The only limitation is that the name of each plugin needs to be unique.
+
 Plugins Definitions
 ===================
 
-The definition file can be written in JSON or YAML, where the data representation consists on attribute-value pairs.
-The principal attributes are:
+The definition file contains all the attributes of the plugin, and can be written in YAML or JSON.
+The most important attributes are:
 
-* name: plugin name used in senpy to call the plugin.
-* module: indicates the module that will be loaded
+* **name**: unique name that senpy will use internally to identify the plugin.
+* **module**: indicates the module that contains the plugin code, which will be automatically loaded by senpy.
+* **version**
+* extra_params: used to specify parameters that the plugin accepts that are not already part of the senpy API. Those parameters may be required, and have aliased names. For instance:
 
-.. code:: python
+  .. code:: yaml
+
+            extra_params:
+                hello_param:
+                    aliases: # required
+                        - hello_param
+                        - hello
+                    required: true
+                    default: Hi you
+                    values:
+                        - Hi you
+                        - Hello y'all
+                        - Howdy
+
+  Parameter validation will fail if a required parameter without a default has not been provided, or if the definition includes a set of values and the provided one does not match one of them.
+
+
+A complete example:
+
+.. code:: yaml
+          
+          name: <Name of the plugin>
+          module: <Python file>
+          version: 0.1
+
+And the json equivalent:
+
+.. code:: json
 
           {
-            "name" : "senpyPlugin",
-            "module" : "{python code file}"
+            "name": "<Name of the plugin>",
+            "module": "<Python file>",
+            "version": "0.1"
           }
 
-.. code:: python
-          
-          name: senpyPlugin
-          module: {python code file}
 
 Plugins Code
-=================
+============
 
 The basic methods in a plugin are:
 
 * __init__
 * activate: used to load memory-hungry resources
 * deactivate: used to free up resources
-* analyse: called in every user requests. It takes in the parameters supplied by a user and should return a senpy Response.
+* analyse_entry: called in every user requests. It takes in the parameters supplied by a user and should yield one or more ``Entry`` objects.
 
 Plugins are loaded asynchronously, so don't worry if the activate method takes too long. The plugin will be marked as activated once it is finished executing the method.
 
+
+Example plugin
+==============
+
+In this section, we will implement a basic sentiment analysis plugin.
+To determine the polarity of each entry, the plugin will compare the length of the string to a threshold.
+This threshold will be included in the definition file.
+
+The definition file would look like this:
+
+.. code:: yaml
+
+          name: helloworld
+          module: helloworld
+          version: 0.0
+          threshold: 10
+
+
+Now, in a file named ``helloworld.py``:
+
+.. code:: python
+
+          #!/bin/env python
+          #helloworld.py
+
+          from senpy.plugins import SenpyPlugin
+          from senpy.models import Sentiment
+
+
+          class HelloWorld(SenpyPlugin):
+
+              def analyse_entry(entry, params):
+                  '''Basically do nothing with each entry'''
+
+                  sentiment = Sentiment()
+                  if len(entry.text) < self.threshold:
+                      sentiment['marl:hasPolarity'] = 'marl:Positive'
+                  else:
+                      sentiment['marl:hasPolarity'] = 'marl:Negative'
+                  entry.sentiments.append(sentiment)
+                  yield entry
+
+
 F.A.Q.
 ======
+Why does the analyse function yield instead of return?
+??????????????????????????????????????????????????????
+
+This is so that plugins may add new entries to the response or filter some of them.
+For instance, a `context detection` plugin may add a new entry for each context in the original entry.
+On the other hand, a conveersion plugin may leave out those entries that do not contain relevant information.
+
+
 If I'm using a classifier, where should I train it?
 ???????????????????????????????????????????????????
 
@@ -78,17 +159,17 @@ This example ilustrate how to implement the Sentiment140 service as a plugin in
 .. code:: python
 
           class Sentiment140Plugin(SentimentPlugin):
-              def analyse(self, **params):
+              def analyse_entry(self, entry, params):
+                  text = entry.text
                   lang = params.get("language", "auto")
                   res = requests.post("http://www.sentiment140.com/api/bulkClassifyJson",
                                       json.dumps({"language": lang,
-                                                  "data": [{"text": params["input"]}]
+                                                  "data": [{"text": text}]
                                                   }
                                                  )
                                       )
 
                   p = params.get("prefix", None)
-                  response = Results(prefix=p)
                   polarity_value = self.maxPolarityValue*int(res.json()["data"][0]
                                                              ["polarity"]) * 0.25
                   polarity = "marl:Neutral"
@@ -98,18 +179,13 @@ This example ilustrate how to implement the Sentiment140 service as a plugin in
                   elif polarity_value < neutral_value:
                       polarity = "marl:Negative"
 
-                  entry = Entry(id="Entry0",
-                                nif__isString=params["input"])
                   sentiment = Sentiment(id="Sentiment0",
                                       prefix=p,
                                       marl__hasPolarity=polarity,
                                       marl__polarityValue=polarity_value)
                   sentiment.prov__wasGeneratedBy = self.id
-                  entry.sentiments = []
                   entry.sentiments.append(sentiment)
-                  entry.language = lang
-                  response.entries.append(entry)
-                  return response
+                  yield entry
 
 
 Where can I define extra parameters to be introduced in the request to my plugin?
@@ -143,9 +219,9 @@ The extraction of this paremeter is used in the analyse method of the Plugin int
 Where can I set up variables for using them in my plugin?
 ?????????????????????????????????????????????????????????
 
-You can add these variables in the definition file with the extracture of attribute-value pair.
+You can add these variables in the definition file with the structure of attribute-value pairs.
 
-Once you have added your variables, the next step is to extract them into the plugin. The plugin's __init__ method has a parameter called `info` where you can extract the values of the variables. This info parameter has the structure of a python dictionary.
+Every field added to the definition file is available to the plugin instance.
 
 Can I activate a DEBUG mode for my plugin?
 ???????????????????????????????????????????
@@ -154,7 +230,15 @@ You can activate the DEBUG mode by the command-line tool using the option -d.
 
 .. code:: bash
 
-   python -m senpy -d
+   senpy -d
+
+
+Additionally, with the ``--pdb`` option you will be dropped into a pdb post mortem shell if an exception is raised.
+
+.. code:: bash
+
+   senpy --pdb
+
 
 Where can I find more code examples?
 ????????????????????????????????????
diff --git a/requirements.txt b/requirements.txt
index f8401eb..0dcc894 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,7 +1,5 @@
 Flask>=0.10.1
-gunicorn>=19.0.0
 requests>=2.4.1
-GitPython>=0.3.2.RC1
 gevent>=1.1rc4
 PyLD>=0.6.5
 six
@@ -9,4 +7,5 @@ future
 jsonschema
 jsonref
 PyYAML
-semver
+rdflib
+rdflib-jsonld
diff --git a/senpy/__init__.py b/senpy/__init__.py
index c2489c7..c9cfdf0 100644
--- a/senpy/__init__.py
+++ b/senpy/__init__.py
@@ -20,21 +20,10 @@ Sentiment analysis server in Python
 from __future__ import print_function
 from .version import __version__
 
-try:
-    import semver
-    __version_info__ = semver.parse_version_info(__version__)
+import logging
 
-    if __version_info__.prerelease:
-        import logging
-        logger = logging.getLogger(__name__)
-        msg = 'WARNING: You are using a pre-release version of {} ({})'.format(
-            __name__, __version__)
-        if len(logging.root.handlers) > 0:
-            logger.info(msg)
-        else:
-            import sys
-            print(msg, file=sys.stderr)
-except ImportError:
-    print('semver not installed. Not doing version checking')
+logger = logging.getLogger(__name__)
+
+logger.info('Using senpy version: {}'.format(__version__))
 
 __all__ = ['api', 'blueprints', 'cli', 'extensions', 'models', 'plugins']
diff --git a/senpy/__main__.py b/senpy/__main__.py
index 72cec87..932f57c 100644
--- a/senpy/__main__.py
+++ b/senpy/__main__.py
@@ -74,7 +74,7 @@ def main():
     parser.add_argument(
         '--host',
         type=str,
-        default="127.0.0.1",
+        default="0.0.0.0",
         help='Use 0.0.0.0 to accept requests from any host.')
     parser.add_argument(
         '--port',
@@ -93,8 +93,7 @@ def main():
         '-i',
         action='store_true',
         default=False,
-        help='Do not run a server, only install plugin dependencies'
-    )
+        help='Do not run a server, only install plugin dependencies')
     args = parser.parse_args()
     logging.basicConfig()
     rl = logging.getLogger()
diff --git a/senpy/api.py b/senpy/api.py
index 0609e26..c90dec5 100644
--- a/senpy/api.py
+++ b/senpy/api.py
@@ -7,6 +7,31 @@ API_PARAMS = {
     "algorithm": {
         "aliases": ["algorithm", "a", "algo"],
         "required": False,
+    },
+    "outformat": {
+        "@id": "outformat",
+        "aliases": ["outformat", "o"],
+        "default": "json-ld",
+        "required": True,
+        "options": ["json-ld", "turtle"],
+    },
+    "expanded-jsonld": {
+        "@id": "expanded-jsonld",
+        "aliases": ["expanded", "expanded-jsonld"],
+        "required": True,
+        "default": 0
+    },
+    "emotionModel": {
+        "@id": "emotionModel",
+        "aliases": ["emotionModel", "emoModel"],
+        "required": False
+    },
+    "conversion": {
+        "@id": "conversion",
+        "description": "How to show the elements that have (not) been converted",
+        "required": True,
+        "options": ["filtered", "nested", "full"],
+        "default": "full"
     }
 }
 
@@ -47,13 +72,6 @@ NIF_PARAMS = {
         "default": "direct",
         "options": ["direct", "url", "file"],
     },
-    "outformat": {
-        "@id": "outformat",
-        "aliases": ["outformat", "o"],
-        "default": "json-ld",
-        "required": False,
-        "options": ["json-ld"],
-    },
     "language": {
         "@id": "language",
         "aliases": ["language", "l"],
@@ -76,12 +94,12 @@ NIF_PARAMS = {
 
 
 def parse_params(indict, spec=NIF_PARAMS):
-    outdict = {}
+    logger.debug("Parsing: {}\n{}".format(indict, spec))
+    outdict = indict.copy()
     wrong_params = {}
     for param, options in iteritems(spec):
         if param[0] != "@":  # Exclude json-ld properties
-            logger.debug("Param: %s - Options: %s", param, options)
-            for alias in options["aliases"]:
+            for alias in options.get("aliases", []):
                 if alias in indict:
                     outdict[param] = indict[alias]
             if param not in outdict:
@@ -95,8 +113,9 @@ def parse_params(indict, spec=NIF_PARAMS):
                    outdict[param] not in spec[param]["options"]:
                     wrong_params[param] = spec[param]
     if wrong_params:
+        logger.debug("Error parsing: %s", wrong_params)
         message = Error(
-            status=404,
+            status=400,
             message="Missing or invalid parameters",
             parameters=outdict,
             errors={param: error
diff --git a/senpy/blueprints.py b/senpy/blueprints.py
index bcc8b63..fd00955 100644
--- a/senpy/blueprints.py
+++ b/senpy/blueprints.py
@@ -17,10 +17,11 @@
 """
 Blueprints for Senpy
 """
-from flask import (Blueprint, request, current_app,
-                   render_template, url_for, jsonify)
+from flask import (Blueprint, request, current_app, render_template, url_for,
+                   jsonify)
 from .models import Error, Response, Plugins, read_schema
-from .api import WEB_PARAMS, parse_params
+from .api import WEB_PARAMS, API_PARAMS, parse_params
+from .version import __version__
 from functools import wraps
 
 import logging
@@ -29,6 +30,7 @@ logger = logging.getLogger(__name__)
 
 api_blueprint = Blueprint("api", __name__)
 demo_blueprint = Blueprint("demo", __name__)
+ns_blueprint = Blueprint("ns", __name__)
 
 
 def get_params(req):
@@ -43,12 +45,21 @@ def get_params(req):
 
 @demo_blueprint.route('/')
 def index():
-    return render_template("index.html")
+    return render_template("index.html", version=__version__)
 
 
 @api_blueprint.route('/contexts/<entity>.jsonld')
 def context(entity="context"):
-    return jsonify({"@context": Response.context})
+    context = Response._context
+    context['@vocab'] = url_for('ns.index', _external=True)
+    return jsonify({"@context": context})
+
+
+@ns_blueprint.route('/')  # noqa: F811
+def index():
+    context = Response._context
+    context['@vocab'] = url_for('.ns', _external=True)
+    return jsonify({"@context": context})
 
 
 @api_blueprint.route('/schemas/<schema>')
@@ -62,26 +73,39 @@ def schema(schema="definitions"):
 def basic_api(f):
     @wraps(f)
     def decorated_function(*args, **kwargs):
-        print('Getting request:')
-        print(request)
         raw_params = get_params(request)
-        web_params = parse_params(raw_params, spec=WEB_PARAMS)
+        headers = {'X-ORIGINAL-PARAMS': raw_params}
+        # Get defaults
+        web_params = parse_params({}, spec=WEB_PARAMS)
+        api_params = parse_params({}, spec=API_PARAMS)
 
-        if hasattr(request, 'params'):
-            request.params.update(raw_params)
-        else:
-            request.params = raw_params
+        outformat = 'json-ld'
         try:
+            print('Getting request:')
+            print(request)
+            web_params = parse_params(raw_params, spec=WEB_PARAMS)
+            api_params = parse_params(raw_params, spec=API_PARAMS)
+            if hasattr(request, 'params'):
+                request.params.update(api_params)
+            else:
+                request.params = api_params
             response = f(*args, **kwargs)
         except Error as ex:
             response = ex
-        in_headers = web_params["inHeaders"] != "0"
-        headers = {'X-ORIGINAL-PARAMS': raw_params}
+
+        in_headers = web_params['inHeaders'] != "0"
+        expanded = api_params['expanded-jsonld']
+        outformat = api_params['outformat']
+
         return response.flask(
             in_headers=in_headers,
             headers=headers,
-            context_uri=url_for(
-                'api.context', entity=type(response).__name__, _external=True))
+            prefix=url_for('.api', _external=True),
+            context_uri=url_for('api.context',
+                                entity=type(response).__name__,
+                                _external=True),
+            outformat=outformat,
+            expanded=expanded)
 
     return decorated_function
 
@@ -106,10 +130,11 @@ def plugins():
 def plugin(plugin=None):
     sp = current_app.senpy
     if plugin == 'default' and sp.default_plugin:
-        response = sp.default_plugin
-        plugin = response.name
-    elif plugin in sp.plugins:
-        response = sp.plugins[plugin]
+        return sp.default_plugin
+    plugins = sp.filter_plugins(
+        id='plugins/{}'.format(plugin)) or sp.filter_plugins(name=plugin)
+    if plugins:
+        response = list(plugins.values())[0]
     else:
         return Error(message="Plugin not found", status=404)
     return response
diff --git a/senpy/client.py b/senpy/client.py
index 53668ff..e64af35 100644
--- a/senpy/client.py
+++ b/senpy/client.py
@@ -6,7 +6,6 @@ logger = logging.getLogger(__name__)
 
 
 class Client(object):
-
     def __init__(self, endpoint):
         self.endpoint = endpoint
 
@@ -15,9 +14,7 @@ class Client(object):
 
     def request(self, path=None, method='GET', **params):
         url = '{}{}'.format(self.endpoint, path)
-        response = requests.request(method=method,
-                                    url=url,
-                                    params=params)
+        response = requests.request(method=method, url=url, params=params)
         try:
             resp = models.from_dict(response.json())
             resp.validate(resp)
@@ -30,8 +27,9 @@ class Client(object):
                           '#### Response:\n'
                           '\tCode: {code}'
                           '\tContent: {content}'
-                          '\n').format(error=ex,
-                                       url=url,
-                                       code=response.status_code,
-                                       content=response.content))
+                          '\n').format(
+                              error=ex,
+                              url=url,
+                              code=response.status_code,
+                              content=response.content))
             raise ex
diff --git a/senpy/extensions.py b/senpy/extensions.py
index 2bc4e74..6231b80 100644
--- a/senpy/extensions.py
+++ b/senpy/extensions.py
@@ -1,15 +1,15 @@
 """
+Main class for Senpy.
+It orchestrates plugin (de)activation and analysis.
 """
 from future import standard_library
 standard_library.install_aliases()
 
-from .plugins import SentimentPlugin
-from .models import Error
-from .blueprints import api_blueprint, demo_blueprint
+from .plugins import SentimentPlugin, SenpyPlugin
+from .models import Error, Entry, Results
+from .blueprints import api_blueprint, demo_blueprint, ns_blueprint
 from .api import API_PARAMS, NIF_PARAMS, parse_params
 
-from git import Repo, InvalidGitRepositoryError
-
 from threading import Thread
 
 import os
@@ -30,18 +30,21 @@ class Senpy(object):
 
     def __init__(self,
                  app=None,
-                 plugin_folder="plugins",
+                 plugin_folder=".",
                  default_plugins=False):
         self.app = app
-
         self._search_folders = set()
         self._plugin_list = []
         self._outdated = True
+        self._default = None
 
         self.add_folder(plugin_folder)
         if default_plugins:
-            base_folder = os.path.join(os.path.dirname(__file__), "plugins")
-            self.add_folder(base_folder)
+            self.add_folder('plugins', from_root=True)
+        else:
+            # Add only conversion plugins
+            self.add_folder(os.path.join('plugins', 'conversion'),
+                            from_root=True)
 
         if app is not None:
             self.init_app(app)
@@ -60,9 +63,12 @@ class Senpy(object):
         else:
             app.teardown_request(self.teardown)
         app.register_blueprint(api_blueprint, url_prefix="/api")
+        app.register_blueprint(ns_blueprint, url_prefix="/ns")
         app.register_blueprint(demo_blueprint, url_prefix="/")
 
-    def add_folder(self, folder):
+    def add_folder(self, folder, from_root=False):
+        if from_root:
+            folder = os.path.join(os.path.dirname(__file__), folder)
         logger.debug("Adding folder: %s", folder)
         if os.path.isdir(folder):
             self._search_folders.add(folder)
@@ -70,10 +76,9 @@ class Senpy(object):
         else:
             logger.debug("Not a folder: %s", folder)
 
-    def analyse(self, **params):
-        algo = None
-        logger.debug("analysing with params: {}".format(params))
+    def _find_plugin(self, params):
         api_params = parse_params(params, spec=API_PARAMS)
+        algo = None
         if "algorithm" in api_params and api_params["algorithm"]:
             algo = api_params["algorithm"]
         elif self.plugins:
@@ -97,32 +102,114 @@ class Senpy(object):
                 status=400,
                 message=("The algorithm '{}'"
                          " is not activated yet").format(algo))
-        plug = self.plugins[algo]
+        return self.plugins[algo]
+
+    def _get_params(self, params, plugin):
         nif_params = parse_params(params, spec=NIF_PARAMS)
-        extra_params = plug.get('extra_params', {})
+        extra_params = plugin.get('extra_params', {})
         specific_params = parse_params(params, spec=extra_params)
         nif_params.update(specific_params)
+        return nif_params
+
+    def _get_entries(self, params):
+        entry = None
+        if params['informat'] == 'text':
+            entry = Entry(text=params['input'])
+        else:
+            raise NotImplemented('Only text input format implemented')
+        yield entry
+
+    def analyse(self, **api_params):
+        logger.debug("analysing with params: {}".format(api_params))
+        plugin = self._find_plugin(api_params)
+        nif_params = self._get_params(api_params, plugin)
+        resp = Results()
+        if 'with_parameters' in api_params:
+            resp.parameters = nif_params
         try:
-            resp = plug.analyse(**nif_params)
-            resp.analysis.append(plug)
+            entries = []
+            for i in self._get_entries(nif_params):
+                entries += list(plugin.analyse_entry(i, nif_params))
+            resp.entries = entries
+            self.convert_emotions(resp, plugin, nif_params)
+            resp.analysis.append(plugin.id)
             logger.debug("Returning analysis result: {}".format(resp))
         except Error as ex:
             logger.exception('Error returning analysis result')
             resp = ex
         except Exception as ex:
-            resp = Error(message=str(ex), status=500)
             logger.exception('Error returning analysis result')
+            resp = Error(message=str(ex), status=500)
         return resp
 
+    def _conversion_candidates(self, fromModel, toModel):
+        candidates = self.filter_plugins(**{'@type': 'emotionConversionPlugin'})
+        for name, candidate in candidates.items():
+            for pair in candidate.onyx__doesConversion:
+                logging.debug(pair)
+
+                if pair['onyx:conversionFrom'] == fromModel \
+                   and pair['onyx:conversionTo'] == toModel:
+                    # logging.debug('Found candidate: {}'.format(candidate))
+                    yield candidate
+
+    def convert_emotions(self, resp, plugin, params):
+        """
+        Conversion of all emotions in a response.
+        In addition to converting from one model to another, it has
+        to include the conversion plugin to the analysis list.
+        Needless to say, this is far from an elegant solution, but it works.
+        @todo refactor and clean up
+        """
+        fromModel = plugin.get('onyx:usesEmotionModel', None)
+        toModel = params.get('emotionModel', None)
+        output = params.get('conversion', None)
+        logger.debug('Asked for model: {}'.format(toModel))
+        logger.debug('Analysis plugin uses model: {}'.format(fromModel))
+
+        if not toModel:
+            return
+        try:
+            candidate = next(self._conversion_candidates(fromModel, toModel))
+        except StopIteration:
+            e = Error(('No conversion plugin found for: '
+                       '{} -> {}'.format(fromModel, toModel)))
+            e.original_response = resp
+            e.parameters = params
+            raise e
+        newentries = []
+        for i in resp.entries:
+            if output == "full":
+                newemotions = i.emotions.copy()
+            else:
+                newemotions = []
+            for j in i.emotions:
+                for k in candidate.convert(j, fromModel, toModel, params):
+                    k.prov__wasGeneratedBy = candidate.id
+                    if output == 'nested':
+                        k.prov__wasDerivedFrom = j
+                    newemotions.append(k)
+            i.emotions = newemotions
+            newentries.append(i)
+        resp.entries = newentries
+        resp.analysis.append(candidate.id)
+
     @property
     def default_plugin(self):
-        candidates = self.filter_plugins(is_activated=True)
-        if len(candidates) > 0:
-            candidate = list(candidates.values())[0]
-            logger.debug("Default: {}".format(candidate.name))
-            return candidate
+        candidate = self._default
+        if not candidate:
+            candidates = self.filter_plugins(is_activated=True)
+            if len(candidates) > 0:
+                candidate = list(candidates.values())[0]
+        logger.debug("Default: {}".format(candidate))
+        return candidate
+
+    @default_plugin.setter
+    def default_plugin(self, value):
+        if isinstance(value, SenpyPlugin):
+            self._default = value
         else:
-            return None
+            self._default = self.plugins[value]
 
     def activate_all(self, sync=False):
         ps = []
@@ -164,6 +251,7 @@ class Senpy(object):
                     plugin.name, ex, traceback.format_exc())
                 logger.error(msg)
                 raise Error(msg)
+
         if sync:
             act()
         else:
@@ -184,8 +272,8 @@ class Senpy(object):
                 plugin.deactivate()
                 logger.info("Plugin deactivated: {}".format(plugin.name))
             except Exception as ex:
-                logger.error("Error deactivating plugin {}: {}".format(
-                    plugin.name, ex))
+                logger.error(
+                    "Error deactivating plugin {}: {}".format(plugin.name, ex))
                 logger.error("Trace: {}".format(traceback.format_exc()))
 
         if sync:
@@ -237,13 +325,6 @@ class Senpy(object):
             logger.debug("No valid plugin for: {}".format(module))
             return
         module = candidate(info=info)
-        repo_path = root
-        try:
-            module._repo = Repo(repo_path)
-        except InvalidGitRepositoryError:
-            logger.debug("The plugin {} is not in a Git repository".format(
-                module))
-            module._repo = None
         return name, module
 
     @classmethod
@@ -261,7 +342,7 @@ class Senpy(object):
             for root, dirnames, filenames in os.walk(search_folder):
                 for filename in fnmatch.filter(filenames, '*.senpy'):
                     name, plugin = self._load_plugin(root, filename)
-                    if plugin and name not in self._plugin_list:
+                    if plugin and name:
                         plugins[name] = plugin
 
         self._outdated = False
@@ -282,8 +363,8 @@ class Senpy(object):
 
         def matches(plug):
             res = all(getattr(plug, k, None) == v for (k, v) in kwargs.items())
-            logger.debug("matching {} with {}: {}".format(plug.name, kwargs,
-                                                          res))
+            logger.debug(
+                "matching {} with {}: {}".format(plug.name, kwargs, res))
             return res
 
         if not kwargs:
diff --git a/senpy/models.py b/senpy/models.py
index ec6ef80..72c3d7f 100644
--- a/senpy/models.py
+++ b/senpy/models.py
@@ -16,6 +16,9 @@ import jsonref
 import jsonschema
 
 from flask import Response as FlaskResponse
+from pyld import jsonld
+
+from rdflib import Graph
 
 import logging
 
@@ -72,31 +75,60 @@ base_context = Context.load(CONTEXT_PATH)
 
 
 class SenpyMixin(object):
-    context = base_context["@context"]
+    _context = base_context["@context"]
 
-    def flask(self, in_headers=True, headers=None, **kwargs):
+    def flask(self,
+              in_headers=True,
+              headers=None,
+              outformat='json-ld',
+              **kwargs):
         """
         Return the values and error to be used in flask.
         So far, it returns a fixed context. We should store/generate different
         contexts if the plugin adds more aliases.
         """
         headers = headers or {}
-        kwargs["with_context"] = True
-        js = self.jsonld(**kwargs)
-        if in_headers:
-            url = js["@context"]
-            del js["@context"]
+        kwargs["with_context"] = not in_headers
+        content, mimetype = self.serialize(format=outformat,
+                                           with_mime=True,
+                                           **kwargs)
+
+        if outformat == 'json-ld' and in_headers:
             headers.update({
-                "Link": ('<%s>;'
-                         'rel="http://www.w3.org/ns/json-ld#context";'
-                         ' type="application/ld+json"' % url)
+                "Link":
+                ('<%s>;'
+                    'rel="http://www.w3.org/ns/json-ld#context";'
+                    ' type="application/ld+json"' % kwargs.get('context_uri'))
             })
         return FlaskResponse(
-            json.dumps(
-                js, indent=2, sort_keys=True),
+            response=content,
             status=getattr(self, "status", 200),
             headers=headers,
-            mimetype="application/json")
+            mimetype=mimetype)
+
+    def serialize(self, format='json-ld', with_mime=False, **kwargs):
+        js = self.jsonld(**kwargs)
+        if format == 'json-ld':
+            content = json.dumps(js, indent=2, sort_keys=True)
+            mimetype = "application/json"
+        elif format in ['turtle', ]:
+            logger.debug(js)
+            content = json.dumps(js, indent=2, sort_keys=True)
+            g = Graph().parse(
+                data=content,
+                format='json-ld',
+                base=kwargs.get('prefix'),
+                context=self._context)
+            logger.debug(
+                'Parsing with prefix: {}'.format(kwargs.get('prefix')))
+            content = g.serialize(format='turtle').decode('utf-8')
+            mimetype = 'text/{}'.format(format)
+        else:
+            raise Error('Unknown outformat: {}'.format(format))
+        if with_mime:
+            return content, mimetype
+        else:
+            return content
 
     def serializable(self):
         def ser_or_down(item):
@@ -115,28 +147,30 @@ class SenpyMixin(object):
 
         return ser_or_down(self._plain_dict())
 
-    def jsonld(self, with_context=False, context_uri=None):
+    def jsonld(self,
+               with_context=True,
+               context_uri=None,
+               prefix=None,
+               expanded=False):
         ser = self.serializable()
 
-        if with_context:
-            context = []
-            if context_uri:
-                context = context_uri
-            else:
-                context = self.context.copy()
-            if hasattr(self, 'prefix'):
-                # This sets @base for the document, which will be used in
-                # all relative URIs. For example, if a uri is "Example" and
-                # prefix =s "http://example.com", the absolute URI after
-                # expanding with JSON-LD will be "http://example.com/Example"
-
-                prefix_context = {"@base": self.prefix}
-                if isinstance(context, list):
-                    context.append(prefix_context)
-                else:
-                    context = [context, prefix_context]
-            ser["@context"] = context
-        return ser
+        result = jsonld.compact(
+            ser,
+            self._context,
+            options={
+                'base': prefix,
+                'expandContext': self._context,
+                'senpy': prefix
+            })
+        if context_uri:
+            result['@context'] = context_uri
+        if expanded:
+            result = jsonld.expand(
+                result, options={'base': prefix,
+                                 'expandContext': self._context})
+        if not with_context:
+            del result['@context']
+        return result
 
     def to_JSON(self, *args, **kwargs):
         js = json.dumps(self.jsonld(*args, **kwargs), indent=4, sort_keys=True)
@@ -161,13 +195,14 @@ class BaseModel(SenpyMixin, dict):
         if 'id' in kwargs:
             self.id = kwargs.pop('id')
         elif kwargs.pop('_auto_id', True):
-            self.id = '_:{}_{}'.format(
-                type(self).__name__, time.time())
+            self.id = '_:{}_{}'.format(type(self).__name__, time.time())
         temp = dict(*args, **kwargs)
 
-        for obj in [self.schema, ] + self.schema.get('allOf', []):
+        for obj in [
+                self.schema,
+        ] + self.schema.get('allOf', []):
             for k, v in obj.get('properties', {}).items():
-                if 'default' in v:
+                if 'default' in v and k not in temp:
                     temp[k] = copy.deepcopy(v['default'])
 
         for i in temp:
@@ -175,10 +210,6 @@ class BaseModel(SenpyMixin, dict):
             if nk != i:
                 temp[nk] = temp[i]
                 del temp[i]
-        if 'context' in temp:
-            context = temp['context']
-            del temp['context']
-            self.__dict__['context'] = Context.load(context)
         try:
             temp['@type'] = getattr(self, '@type')
         except AttributeError:
@@ -239,10 +270,11 @@ def from_schema(name, schema_file=None, base_classes=None):
     base_classes = base_classes or []
     base_classes.append(BaseModel)
     schema_file = schema_file or '{}.json'.format(name)
-    class_name = '{}{}'.format(i[0].upper(), i[1:])
+    class_name = '{}{}'.format(name[0].upper(), name[1:])
     newclass = type(class_name, tuple(base_classes), {})
     setattr(newclass, '@type', name)
     setattr(newclass, 'schema', read_schema(schema_file))
+    setattr(newclass, 'class_name', class_name)
     register(newclass, name)
     return newclass
 
@@ -253,29 +285,31 @@ def _add_from_schema(*args, **kwargs):
     del generatedClass
 
 
-for i in ['response',
-          'results',
-          'entry',
-          'sentiment',
-          'analysis',
-          'emotionSet',
-          'emotion',
-          'emotionModel',
-          'suggestion',
-          'plugin',
-          'emotionPlugin',
-          'sentimentPlugin',
-          'plugins']:
+for i in [
+        'analysis',
+        'emotion',
+        'emotionConversion',
+        'emotionConversionPlugin',
+        'emotionAnalysis',
+        'emotionModel',
+        'emotionPlugin',
+        'emotionSet',
+        'entry',
+        'plugin',
+        'plugins',
+        'response',
+        'results',
+        'sentiment',
+        'sentimentPlugin',
+        'suggestion',
+]:
     _add_from_schema(i)
 
 _ErrorModel = from_schema('error')
 
 
 class Error(SenpyMixin, BaseException):
-    def __init__(self,
-                 message,
-                 *args,
-                 **kwargs):
+    def __init__(self, message, *args, **kwargs):
         super(Error, self).__init__(self, message, message)
         self._error = _ErrorModel(message=message, *args, **kwargs)
         self.message = message
diff --git a/senpy/plugins.py b/senpy/plugins.py
index 512b125..693cb43 100644
--- a/senpy/plugins.py
+++ b/senpy/plugins.py
@@ -6,6 +6,7 @@ import os.path
 import pickle
 import logging
 import tempfile
+import copy
 from . import models
 
 logger = logging.getLogger(__name__)
@@ -13,21 +14,38 @@ logger = logging.getLogger(__name__)
 
 class SenpyPlugin(models.Plugin):
     def __init__(self, info=None):
+        """
+        Provides a canonical name for plugins and serves as base for other
+        kinds of plugins.
+        """
         if not info:
             raise models.Error(message=("You need to provide configuration"
                                         "information for the plugin."))
         logger.debug("Initialising {}".format(info))
-        super(SenpyPlugin, self).__init__(info)
-        self.id = '{}_{}'.format(self.name, self.version)
-        self._info = info
+        id = 'plugins/{}_{}'.format(info['name'], info['version'])
+        super(SenpyPlugin, self).__init__(id=id, **info)
         self.is_activated = False
 
     def get_folder(self):
         return os.path.dirname(inspect.getfile(self.__class__))
 
     def analyse(self, *args, **kwargs):
-        logger.debug("Analysing with: {} {}".format(self.name, self.version))
-        pass
+        raise NotImplemented(
+            'Your method should implement either analyse or analyse_entry')
+
+    def analyse_entry(self, entry, parameters):
+        """ An implemented plugin should override this method.
+        This base method is here to adapt old style plugins which only
+        implement the *analyse* function.
+        Note that this method may yield an annotated entry or a list of
+        entries (e.g. in a tokenizer)
+        """
+        text = entry['text']
+        params = copy.copy(parameters)
+        params['input'] = text
+        results = self.analyse(**params)
+        for i in results.entries:
+            yield i
 
     def activate(self):
         pass
@@ -35,25 +53,24 @@ class SenpyPlugin(models.Plugin):
     def deactivate(self):
         pass
 
-    def __del__(self):
-        ''' Destructor, to make sure all the resources are freed '''
-        self.deactivate()
 
-
-class SentimentPlugin(SenpyPlugin, models.SentimentPlugin):
+class SentimentPlugin(models.SentimentPlugin, SenpyPlugin):
     def __init__(self, info, *args, **kwargs):
         super(SentimentPlugin, self).__init__(info, *args, **kwargs)
         self.minPolarityValue = float(info.get("minPolarityValue", 0))
         self.maxPolarityValue = float(info.get("maxPolarityValue", 1))
-        self["@type"] = "marl:SentimentAnalysis"
 
 
-class EmotionPlugin(SentimentPlugin, models.EmotionPlugin):
+class EmotionPlugin(models.EmotionPlugin, SenpyPlugin):
     def __init__(self, info, *args, **kwargs):
         super(EmotionPlugin, self).__init__(info, *args, **kwargs)
-        self.minEmotionValue = float(info.get("minEmotionValue", 0))
-        self.maxEmotionValue = float(info.get("maxEmotionValue", 0))
-        self["@type"] = "onyx:EmotionAnalysis"
+        self.minEmotionValue = float(info.get("minEmotionValue", -1))
+        self.maxEmotionValue = float(info.get("maxEmotionValue", 1))
+
+
+class EmotionConversionPlugin(models.EmotionConversionPlugin, SenpyPlugin):
+    def __init__(self, info, *args, **kwargs):
+        super(EmotionConversionPlugin, self).__init__(info, *args, **kwargs)
 
 
 class ShelfMixin(object):
@@ -74,13 +91,10 @@ class ShelfMixin(object):
 
     @property
     def shelf_file(self):
-        if not hasattr(self, '_shelf_file') or not self._shelf_file:
-            if hasattr(self, '_info') and 'shelf_file' in self._info:
-                self.__dict__['_shelf_file'] = self._info['shelf_file']
-            else:
-                self._shelf_file = os.path.join(tempfile.gettempdir(),
-                                                self.name + '.p')
-        return self._shelf_file
+        if 'shelf_file' not in self or not self['shelf_file']:
+            self.shelf_file = os.path.join(tempfile.gettempdir(),
+                                           self.name + '.p')
+        return self['shelf_file']
 
     def save(self):
         logger.debug('saving pickle')
diff --git a/senpy/plugins/conversion/emotion/ekman2vad.py b/senpy/plugins/conversion/emotion/ekman2vad.py
new file mode 100644
index 0000000..0fed98d
--- /dev/null
+++ b/senpy/plugins/conversion/emotion/ekman2vad.py
@@ -0,0 +1,56 @@
+from senpy.plugins import EmotionConversionPlugin
+from senpy.models import EmotionSet, Emotion, Error
+
+import logging
+logger = logging.getLogger(__name__)
+
+import math
+
+
+class WNA2VAD(EmotionConversionPlugin):
+
+    def _ekman_to_vad(self, ekmanSet):
+        potency = 0
+        arousal = 0
+        dominance = 0
+        for e in ekmanSet.onyx__hasEmotion:
+            category = e.onyx__hasEmotionCategory
+            centroid = self.centroids[category]
+            potency += centroid['V']
+            arousal += centroid['A']
+            dominance += centroid['D']
+        e = Emotion({'emoml:potency': potency,
+                     'emoml:arousal': arousal,
+                     'emoml:dominance': dominance})
+        return e
+
+    def _vad_to_ekman(self, VADEmotion):
+        V = VADEmotion['emoml:valence']
+        A = VADEmotion['emoml:potency']
+        D = VADEmotion['emoml:dominance']
+        emotion = ''
+        value = 10000000000000000000000.0
+        for state in self.centroids:
+            valence = V - self.centroids[state]['V']
+            arousal = A - self.centroids[state]['A']
+            dominance = D - self.centroids[state]['D']
+            new_value = math.sqrt((valence**2) +
+                                  (arousal**2) +
+                                  (dominance**2))
+            if new_value < value:
+                value = new_value
+                emotion = state
+        result = Emotion(onyx__hasEmotionCategory=emotion)
+        return result
+
+    def convert(self, emotionSet, fromModel, toModel, params):
+        logger.debug('{}\n{}\n{}\n{}'.format(emotionSet, fromModel, toModel, params))
+        e = EmotionSet()
+        if fromModel == 'emoml:big6':
+            e.onyx__hasEmotion.append(self._ekman_to_vad(emotionSet))
+        elif fromModel == 'emoml:fsre-dimensions':
+            for i in emotionSet.onyx__hasEmotion:
+                e.onyx__hasEmotion.append(self._vad_to_ekman(e))
+        else:
+            raise Error('EMOTION MODEL NOT KNOWN')
+        yield e
diff --git a/senpy/plugins/conversion/emotion/ekman2vad.senpy b/senpy/plugins/conversion/emotion/ekman2vad.senpy
new file mode 100644
index 0000000..d50b13d
--- /dev/null
+++ b/senpy/plugins/conversion/emotion/ekman2vad.senpy
@@ -0,0 +1,35 @@
+---
+name: Ekman2VAD
+module: ekman2vad
+description: Plugin to convert from Ekman to VAD
+version: 0.1
+onyx:doesConversion:
+  - onyx:conversionFrom: emoml:big6
+    onyx:conversionTo: emoml:fsre-dimensions
+  - onyx:conversionFrom: emoml:fsre-dimensions
+    onyx:conversionTo: wna:WNAModel
+centroids:
+  emoml:big6anger:
+    A: 6.95
+    D: 5.1
+    V: 2.7
+  emoml:big6disgust:
+    A: 5.3
+    D: 8.05
+    V: 2.7
+  emoml:big6fear:
+    A: 6.5
+    D: 3.6
+    V: 3.2
+  emoml:big6happiness:
+    A: 7.22
+    D: 6.28
+    V: 8.6
+  emoml:big6sadness:
+    A: 5.21
+    D: 2.82
+    V: 2.21
+aliases:
+  A: emoml:arousal
+  V: emoml:potency
+  D: emoml:dominance
\ No newline at end of file
diff --git a/senpy/plugins/example/emoRand/emoRand.py b/senpy/plugins/example/emoRand/emoRand.py
new file mode 100644
index 0000000..8de8e81
--- /dev/null
+++ b/senpy/plugins/example/emoRand/emoRand.py
@@ -0,0 +1,18 @@
+import random
+
+from senpy.plugins import EmotionPlugin
+from senpy.models import EmotionSet, Emotion
+
+
+class RmoRandPlugin(EmotionPlugin):
+    def analyse_entry(self, entry, params):
+        category = "emoml:big6happiness"
+        number = max(-1, min(1, random.gauss(0, 0.5)))
+        if number > 0:
+            category = "emoml:big6anger"
+        emotionSet = EmotionSet()
+        emotion = Emotion({"onyx:hasEmotionCategory": category})
+        emotionSet.onyx__hasEmotion.append(emotion)
+        emotionSet.prov__wasGeneratedBy = self.id
+        entry.emotions.append(emotionSet)
+        yield entry
diff --git a/senpy/plugins/example/emoRand/emoRand.senpy b/senpy/plugins/example/emoRand/emoRand.senpy
new file mode 100644
index 0000000..a3ffae8
--- /dev/null
+++ b/senpy/plugins/example/emoRand/emoRand.senpy
@@ -0,0 +1,9 @@
+---
+name: emoRand
+module: emoRand
+description: A sample plugin that returns a random emotion annotation
+author: "@balkian"
+version: '0.1'
+url: "https://github.com/gsi-upm/senpy-plugins-community"
+requirements: {}
+onyx:usesEmotionModel: "emoml:big6"
\ No newline at end of file
diff --git a/senpy/plugins/rand/rand.py b/senpy/plugins/example/rand/rand.py
similarity index 62%
rename from senpy/plugins/rand/rand.py
rename to senpy/plugins/example/rand/rand.py
index a6f7639..aa92c70 100644
--- a/senpy/plugins/rand/rand.py
+++ b/senpy/plugins/example/rand/rand.py
@@ -1,29 +1,24 @@
 import random
 
 from senpy.plugins import SentimentPlugin
-from senpy.models import Results, Sentiment, Entry
+from senpy.models import Sentiment
 
 
-class Sentiment140Plugin(SentimentPlugin):
-    def analyse(self, **params):
+class RandPlugin(SentimentPlugin):
+    def analyse_entry(self, entry, params):
         lang = params.get("language", "auto")
 
-        response = Results()
         polarity_value = max(-1, min(1, random.gauss(0.2, 0.2)))
         polarity = "marl:Neutral"
         if polarity_value > 0:
             polarity = "marl:Positive"
         elif polarity_value < 0:
             polarity = "marl:Negative"
-        entry = Entry({"id": ":Entry0", "nif:isString": params["input"]})
         sentiment = Sentiment({
-            "id": ":Sentiment0",
             "marl:hasPolarity": polarity,
             "marl:polarityValue": polarity_value
         })
         sentiment["prov:wasGeneratedBy"] = self.id
-        entry.sentiments = []
         entry.sentiments.append(sentiment)
         entry.language = lang
-        response.entries.append(entry)
-        return response
+        yield entry
diff --git a/senpy/plugins/example/rand/rand.senpy b/senpy/plugins/example/rand/rand.senpy
new file mode 100644
index 0000000..b7ee693
--- /dev/null
+++ b/senpy/plugins/example/rand/rand.senpy
@@ -0,0 +1,10 @@
+---
+name: rand
+module: rand
+description: A sample plugin that returns a random sentiment annotation
+author: "@balkian"
+version: '0.1'
+url: "https://github.com/gsi-upm/senpy-plugins-community"
+requirements: {}
+marl:maxPolarityValue: '1'
+marl:minPolarityValue: "-1"
diff --git a/senpy/plugins/rand/rand.senpy b/senpy/plugins/rand/rand.senpy
deleted file mode 100644
index b7c8c57..0000000
--- a/senpy/plugins/rand/rand.senpy
+++ /dev/null
@@ -1,18 +0,0 @@
-{
-    "name": "rand",
-    "module": "rand",
-    "description": "What my plugin broadly does",
-    "author": "@balkian",
-    "version": "0.1",
-    "extra_params": {
-        "language": {
-            "@id": "lang_rand",
-            "aliases": ["language", "l"],
-            "required": false,
-            "options": ["es", "en", "auto"]
-        }
-     },
-     "requirements": {},
-     "marl:maxPolarityValue": "1",
-     "marl:minPolarityValue": "-1"
-}
diff --git a/senpy/plugins/sentiment140/sentiment140.py b/senpy/plugins/sentiment/sentiment140/sentiment140.py
similarity index 69%
rename from senpy/plugins/sentiment140/sentiment140.py
rename to senpy/plugins/sentiment/sentiment140/sentiment140.py
index 3090c02..b8e6d6f 100644
--- a/senpy/plugins/sentiment140/sentiment140.py
+++ b/senpy/plugins/sentiment/sentiment140/sentiment140.py
@@ -2,24 +2,22 @@ import requests
 import json
 
 from senpy.plugins import SentimentPlugin
-from senpy.models import Results, Sentiment, Entry
+from senpy.models import Sentiment
 
 
 class Sentiment140Plugin(SentimentPlugin):
-    def analyse(self, **params):
+    def analyse_entry(self, entry, params):
         lang = params.get("language", "auto")
         res = requests.post("http://www.sentiment140.com/api/bulkClassifyJson",
                             json.dumps({
                                 "language": lang,
                                 "data": [{
-                                    "text": params["input"]
+                                    "text": entry.text
                                 }]
                             }))
-
         p = params.get("prefix", None)
-        response = Results(prefix=p)
-        polarity_value = self.maxPolarityValue * int(res.json()["data"][0][
-            "polarity"]) * 0.25
+        polarity_value = self.maxPolarityValue * int(
+            res.json()["data"][0]["polarity"]) * 0.25
         polarity = "marl:Neutral"
         neutral_value = self.maxPolarityValue / 2.0
         if polarity_value > neutral_value:
@@ -27,9 +25,7 @@ class Sentiment140Plugin(SentimentPlugin):
         elif polarity_value < neutral_value:
             polarity = "marl:Negative"
 
-        entry = Entry(id="Entry0", nif__isString=params["input"])
         sentiment = Sentiment(
-            id="Sentiment0",
             prefix=p,
             marl__hasPolarity=polarity,
             marl__polarityValue=polarity_value)
@@ -37,5 +33,4 @@ class Sentiment140Plugin(SentimentPlugin):
         entry.sentiments = []
         entry.sentiments.append(sentiment)
         entry.language = lang
-        response.entries.append(entry)
-        return response
+        yield entry
diff --git a/senpy/plugins/sentiment/sentiment140/sentiment140.senpy b/senpy/plugins/sentiment/sentiment140/sentiment140.senpy
new file mode 100644
index 0000000..f2c92b3
--- /dev/null
+++ b/senpy/plugins/sentiment/sentiment140/sentiment140.senpy
@@ -0,0 +1,21 @@
+---
+name: sentiment140
+module: sentiment140
+description: "Connects to the sentiment140 free API: http://sentiment140.com"
+author: "@balkian"
+version: '0.2'
+url: "https://github.com/gsi-upm/senpy-plugins-community"
+extra_params:
+  language:
+    "@id": lang_sentiment140
+    aliases:
+    - language
+    - l
+    required: false
+    options:
+    - es
+    - en
+    - auto
+requirements: {}
+maxPolarityValue: 1
+minPolarityValue: 0
\ No newline at end of file
diff --git a/senpy/plugins/sentiment140/sentiment140.senpy b/senpy/plugins/sentiment140/sentiment140.senpy
deleted file mode 100644
index 976ae4a..0000000
--- a/senpy/plugins/sentiment140/sentiment140.senpy
+++ /dev/null
@@ -1,18 +0,0 @@
-{
-    "name": "sentiment140",
-    "module": "sentiment140",
-    "description": "What my plugin broadly does",
-    "author": "@balkian",
-    "version": "0.1",
-    "extra_params": {
-        "language": {
-            "@id": "lang_sentiment140",
-            "aliases": ["language", "l"],
-            "required": false,
-            "options": ["es", "en", "auto"]
-        }
-     },
-     "requirements": {},
-     "maxPolarityValue": "1",
-     "minPolarityValue": "0"
-}
diff --git "a/senpy/schemas/\\" "b/senpy/schemas/\\"
deleted file mode 100644
index dd76fa5..0000000
--- "a/senpy/schemas/\\"
+++ /dev/null
@@ -1,7 +0,0 @@
-{
-  "$schema": "http://json-schema.org/draft-04/schema#",
-  "description": "Senpy analysis",
-  "allOf": [{
-    "$ref": "atom.json"
-  }]
-}
diff --git a/senpy/schemas/context.jsonld b/senpy/schemas/context.jsonld
index 136c683..795b0e6 100644
--- a/senpy/schemas/context.jsonld
+++ b/senpy/schemas/context.jsonld
@@ -6,34 +6,51 @@
     "prov": "http://www.w3.org/ns/prov#",
     "nif": "http://persistence.uni-leipzig.org/nlp2rdf/ontologies/nif-core#",
     "marl": "http://www.gsi.dit.upm.es/ontologies/marl/ns#",
-    "onyx": "http://www.gsi.dit.upm.es/ontologies/onyx#",
-    "wnaffect": "http://www.gsi.dit.upm.es/ontologies/wnaffect#",
+    "onyx": "http://www.gsi.dit.upm.es/ontologies/onyx/ns#",
+    "wna": "http://www.gsi.dit.upm.es/ontologies/wnaffect/ns#",
+    "emoml": "http://www.gsi.dit.upm.es/ontologies/onyx/vocabularies/emotionml/ns#",
     "xsd": "http://www.w3.org/2001/XMLSchema#",
     "topics": {
-        "@id": "dc:subject"
+      "@id": "dc:subject"
     },
     "entities": {
-    "@id": "me:hasEntities"
+      "@id": "me:hasEntities"
     },
     "suggestions": {
-        "@id": "me:hasSuggestions",
-        "@container": "@set"
+      "@id": "me:hasSuggestions",
+      "@container": "@set"
     },
     "emotions": {
-        "@id": "onyx:hasEmotionSet",
-        "@container": "@set"
+      "@id": "onyx:hasEmotionSet",
+      "@container": "@set"
     },
     "sentiments": {
-        "@id": "marl:hasOpinion",
-        "@container": "@set"
+      "@id": "marl:hasOpinion",
+      "@container": "@set"
     },
     "entries": {
-        "@id": "prov:used",
-        "@container": "@set"
+      "@id": "prov:used",
+      "@container": "@set"
     },
     "analysis": {
-        "@id": "prov:wasGeneratedBy"
-
+      "@id": "AnalysisInvolved",
+      "@type": "@id",
+      "@container": "@set"
+    },
+    "prov:wasGeneratedBy": {
+      "@type": "@id"
+    },
+    "onyx:usesEmotionModel": {
+      "@type": "@id"
+    },
+    "onyx:hasEmotionCategory": {
+      "@type": "@id"
+    },
+    "onyx:conversionFrom": {
+      "@type": "@id"
+    },
+    "onyx:conversionTo": {
+      "@type": "@id"
     }
   }
 }
diff --git a/senpy/schemas/emotionAnalysis.json b/senpy/schemas/emotionAnalysis.json
index 41a9f60..6b64db7 100644
--- a/senpy/schemas/emotionAnalysis.json
+++ b/senpy/schemas/emotionAnalysis.json
@@ -6,13 +6,14 @@
     {"$ref": "analysis.json"},
     {"properties":
      {
-       "onyx:hasEmotionModel": {
+       "onyx:usesEmotionModel": {
          "anyOf": [
            {"type": "string"},
            {"$ref": "emotionModel.json"}
          ]
        }
      },
-     "required": ["onyx:hasEmotionModel"]
+     "required": ["onyx:hasEmotionModel",
+                  "@type"]
     }]
 }
diff --git a/senpy/schemas/emotionConversion.json b/senpy/schemas/emotionConversion.json
new file mode 100644
index 0000000..b330b39
--- /dev/null
+++ b/senpy/schemas/emotionConversion.json
@@ -0,0 +1,12 @@
+{
+  "$schema": "http://json-schema.org/draft-04/schema#",
+  "properties": {
+    "onyx:conversionFrom": {
+      "$ref": "emotionModel.json"
+    },
+    "onyx:conversionTo": {
+      "$ref": "emotionModel.json"
+    }
+  },
+  "required": ["onyx:conversionFrom", "onyx:conversionTo"]
+}
diff --git a/senpy/schemas/emotionConversionPlugin.json b/senpy/schemas/emotionConversionPlugin.json
new file mode 100644
index 0000000..1c8b604
--- /dev/null
+++ b/senpy/schemas/emotionConversionPlugin.json
@@ -0,0 +1,19 @@
+{
+  "$schema": "http://json-schema.org/draft-04/schema#",
+  "type": "object",
+  "allOf": [
+    {
+      "$ref": "plugin.json"
+    },
+    {
+      "properties": {
+        "onyx:doesConversion": {
+          "type": "array",
+          "items": {
+            "$ref": "emotionConversion.json"
+          }
+        }
+      }
+    }
+  ]
+}
diff --git a/senpy/schemas/emotionPlugin.json b/senpy/schemas/emotionPlugin.json
index c36a859..cd010c4 100644
--- a/senpy/schemas/emotionPlugin.json
+++ b/senpy/schemas/emotionPlugin.json
@@ -1,7 +1,7 @@
 {
   "$schema": "http://json-schema.org/draft-04/schema#",
   "type": "object",
-  "$allOf": [
+  "allOf": [
     {
       "$ref": "plugin.json"
     },
diff --git a/senpy/schemas/entry.json b/senpy/schemas/entry.json
index 9eef1e2..c1bb4fc 100644
--- a/senpy/schemas/entry.json
+++ b/senpy/schemas/entry.json
@@ -11,23 +11,28 @@
     },
     "sentiments": {
       "type": "array",
-      "items": {"$ref": "sentiment.json" }
+      "items": {"$ref": "sentiment.json" },
+      "default": []
     },
     "emotions": {
       "type": "array",
-      "items": {"$ref": "emotionSet.json" }
+      "items": {"$ref": "emotionSet.json" },
+      "default": []
     },
     "entities": {
       "type": "array",
-      "items": {"$ref": "entity.json" }
+      "items": {"$ref": "entity.json" },
+      "default": []
     },
     "topics": {
       "type": "array",
-      "items": {"$ref": "topic.json" }
+      "items": {"$ref": "topic.json" },
+      "default": []
     },
     "suggestions": {
       "type": "array",
-      "items": {"$ref": "suggestion.json" }
+      "items": {"$ref": "suggestion.json" },
+      "default": []
     }
   },
   "required": ["@id", "nif:isString"]
diff --git a/senpy/schemas/error.json b/senpy/schemas/error.json
index 7cdf582..cbbd176 100644
--- a/senpy/schemas/error.json
+++ b/senpy/schemas/error.json
@@ -2,7 +2,7 @@
   "$schema": "http://json-schema.org/draft-04/schema#",
   "description": "Base schema for all Senpy objects",
   "type": "object",
-  "$allOf": [
+  "allOf": [
     {"$ref": "atom.json"},
     {
       "properties": {
@@ -10,14 +10,14 @@
           "type": "string"
         },
         "errors": {
-          "type": "list",
+          "type": "array",
           "items": {"type": "object"}
         },
         "status": {
-          "type": "int"
-        },
-        "required": ["message"]
-      }
+          "type": "number"
+        }
+      },
+      "required": ["message"]
     }
   ]
 }
diff --git a/senpy/schemas/sentimentPlugin.json b/senpy/schemas/sentimentPlugin.json
index 26830cd..b20152e 100644
--- a/senpy/schemas/sentimentPlugin.json
+++ b/senpy/schemas/sentimentPlugin.json
@@ -1,7 +1,7 @@
 {
   "$schema": "http://json-schema.org/draft-04/schema#",
   "type": "object",
-  "$allOf": [
+  "allOf": [
     {
       "$ref": "plugin.json"
     },
diff --git a/senpy/schemas/suggestion.json b/senpy/schemas/suggestion.json
index 70090b1..da1ecf3 100644
--- a/senpy/schemas/suggestion.json
+++ b/senpy/schemas/suggestion.json
@@ -1,4 +1,5 @@
 {
   "$schema": "http://json-schema.org/draft-04/schema#",
-  "type": "object"
+  "type": "object",
+  "required": ["@id", "prov:wasGeneratedBy"]
 }
diff --git a/senpy/static/css/main.css b/senpy/static/css/main.css
index 8365597..112be75 100644
--- a/senpy/static/css/main.css
+++ b/senpy/static/css/main.css
@@ -8,7 +8,7 @@ body {
 }
 #inputswrapper {
     min-height:100%;
-    background: white;
+    /* background: white; */
     position:relative;
     min-width: 800px;
     height: 100%;
@@ -50,25 +50,16 @@ body {
 #form {
   width: 100%;
 }
-#results {
+.results {
     overflow: auto;
-    padding: 20px;
-    background: lightgray;
-     -moz-border-radius: 20px;
-     -webkit-border-radius: 20px;
-     -khtml-border-radius: 20px;
-     border-radius: 20px;
+    /* padding: 20px; */
+    background: white;
+     /* -moz-border-radius: 20px; */
+     /* -webkit-border-radius: 20px; */
+     /* -khtml-border-radius: 20px; */
+     /* border-radius: 20px; */
 
 }
-#jsonraw {
-    overflow: auto;
-    padding: 20px;
-    background: lightgray;
-     -moz-border-radius: 20px;
-     -webkit-border-radius: 20px;
-     -khtml-border-radius: 20px;
-     border-radius: 20px;
-}
 #input_request { 
     margin-top: 5px;
     display:block;
@@ -156,3 +147,8 @@ textarea{
 #header {
   font-family: 'Architects Daughter', cursive;
 }
+
+#results-div {
+    /* background: white; */
+    display: none;
+}
diff --git a/senpy/static/js/main.js b/senpy/static/js/main.js
index b8dcbe9..cf9f2f1 100644
--- a/senpy/static/js/main.js
+++ b/senpy/static/js/main.js
@@ -32,39 +32,48 @@ $(document).ready(function() {
     var availablePlugins = document.getElementById('availablePlugins');
     plugins = response.plugins;
     for (r in plugins){
-      if (plugins[r]["name"]){
-        if (plugins[r]["name"] == defaultPlugin["name"]){
-          if (plugins[r]["is_activated"]){
-            html+= "<option value=\""+plugins[r]["name"]+"\" selected=\"selected\">"+plugins[r]["name"]+"</option>"
+      plugin = plugins[r]
+      if (plugin["name"]){
+        if (plugin["name"] == defaultPlugin["name"]){
+          if (plugin["is_activated"]){
+            html+= "<option value=\""+plugin["name"]+"\" selected=\"selected\">"+plugin["name"]+"</option>"
           }else{
-            html+= "<option value=\""+plugins[r]["name"]+"\" selected=\"selected\" disabled=\"disabled\">"+plugins[r]["name"]+"</option>"
+            html+= "<option value=\""+plugin["name"]+"\" selected=\"selected\" disabled=\"disabled\">"+plugin["name"]+"</option>"
           }
         }
         else{
-          if (plugins[r]["is_activated"]){
-            html+= "<option value=\""+plugins[r]["name"]+"\">"+plugins[r]["name"]+"</option>"
+          if (plugin["is_activated"]){
+            html+= "<option value=\""+plugin["name"]+"\">"+plugin["name"]+"</option>"
           }
           else{
-            html+= "<option value=\""+plugins[r]["name"]+"\" disabled=\"disabled\">"+plugins[r]["name"]+"</option>"
+            html+= "<option value=\""+plugin["name"]+"\" disabled=\"disabled\">"+plugin["name"]+"</option>"
           }
         }
       }
-      if (plugins[r]["extra_params"]){
-        plugins_params[plugins[r]["name"]]={};
-        for (param in plugins[r]["extra_params"]){
-          if (typeof plugins[r]["extra_params"][param] !="string"){
+      if (plugin["extra_params"]){
+        plugins_params[plugin["name"]]={};
+        for (param in plugin["extra_params"]){
+          if (typeof plugin["extra_params"][param] !="string"){
             var params = new Array();
-            var alias = plugins[r]["extra_params"][param]["aliases"][0];
+            var alias = plugin["extra_params"][param]["aliases"][0];
             params[alias]=new Array();
-            for (option in plugins[r]["extra_params"][param]["options"]){
-              params[alias].push(plugins[r]["extra_params"][param]["options"][option])
+            for (option in plugin["extra_params"][param]["options"]){
+              params[alias].push(plugin["extra_params"][param]["options"][option])
             }
-            plugins_params[plugins[r]["name"]][alias] = (params[alias])
+            plugins_params[plugin["name"]][alias] = (params[alias])
           }
         }
       }
       var pluginList = document.createElement('li');
-      pluginList.innerHTML = "<a href=https://github.com/gsi-upm/senpy-plugins-community>" + plugins[r]["name"] + "</a>" + ": " + plugins[r]["description"]
+      
+      newHtml = ""
+      if(plugin.url) {
+        newHtml= "<a href="+plugin.url+">" + plugin.name + "</a>";
+      }else {
+        newHtml= plugin["name"];
+      }
+      newHtml += ": " + replaceURLWithHTMLLinks(plugin.description);
+      pluginList.innerHTML = newHtml;
       availablePlugins.appendChild(pluginList)
     }
     document.getElementById('plugins').innerHTML = html;
@@ -96,6 +105,10 @@ function change_params(){
 
 function load_JSON(){
       url = "/api";
+      var container = document.getElementById('results');
+      var rawcontainer = document.getElementById("jsonraw");
+      rawcontainer.innerHTML = '';
+      container.innerHTML = '';
       var plugin = document.getElementById("plugins").options[document.getElementById("plugins").selectedIndex].value;
       var input = encodeURIComponent(document.getElementById("input").value);
       url += "?algo="+plugin+"&i="+input
@@ -108,18 +121,14 @@ function load_JSON(){
         }
       }
       var response = JSON.parse($.ajax({type: "GET", url: url , async: false}).responseText);
-      var container = document.getElementById('results');
       var options = {
         mode: 'view'
       };
-      try { 
-        container.removeChild(container.firstChild);
-      }
-      catch(err) {
-      }
       var editor = new JSONEditor(container, options, response);
-      document.getElementById("jsonraw").innerHTML = replaceURLWithHTMLLinks(JSON.stringify(response, undefined, 2))
+      editor.expandAll();
+      rawcontainer.innerHTML = replaceURLWithHTMLLinks(JSON.stringify(response, undefined, 2))
       document.getElementById("input_request").innerHTML = "<a href='"+url+"'>"+url+"</a>"
+      document.getElementById("results-div").style.display = 'block';
       
 
 }
diff --git a/senpy/templates/index.html b/senpy/templates/index.html
index d9fe0c6..9626de1 100755
--- a/senpy/templates/index.html
+++ b/senpy/templates/index.html
@@ -2,7 +2,7 @@
 <html>
   <head>
     <meta http-equiv="content-type" content="text/html; charset=utf-8" />
-    <title>Playground</title>
+    <title>Playground {{version}}</title>
 
   </head>
   <script src="static/js/jquery-2.1.1.min.js" ></script>
@@ -25,49 +25,68 @@
         <h3 id="header-title">
           <a href="https://github.com/gsi-upm/senpy" target="_blank">
             <img id="header-logo" class="imsg-responsive" src="static/img/header.png"/></a> Playground
-
         </h3>
+          <h4>v{{ version}}</h4>
       </div>
 
       <ul class="nav nav-tabs" role="tablist">
-        <li role="presentation" class="active"><a class="active" href="#about">About</a></li>
-        <li role="presentation"><a class="active" href="#test">Test it</a></li>
+        <li role="presentation" ><a class="active" href="#about">About</a></li>
+        <li role="presentation"class="active"><a class="active" href="#test">Test it</a></li>
       </ul>
 
       <div class="tab-content">
-        <div class="tab-pane active" id="about">
+        <div class="tab-pane" id="about">
+
           <div class="row">
-            <div class="col-lg-6 ">
-              <div class="well">
-                <h2>Test Senpy</h2>
-                <div>
-                  <p class="text-center">
-                    <a class="btn btn-lg btn-primary" href="#test" role="button">Test it »</a>
+                <div class="col-lg-6">
+                  <h2>About Senpy</h2>
+                  <p>Senpy is a framework to build semantic sentiment and emotion analysis services. It does so by using a mix of web and semantic technologies, such as JSON-LD, RDFlib and Flask.</p>
+                  <p>Senpy makes it easy to develop and publish your own analysis algorithms (plugins in senpy terms).
+                  </p>
+                  <p>
+                    This website is the senpy Playground, which allows you to test the instance of senpy in this server. It provides a user-friendly interface to the functions exposed by the senpy API.
+                    </p>
+                  <p>
+                    Once you get comfortable with the parameters and results, you are encouraged to issue your own requests to the API endpoint, which should be <a href="/api">here</a>.
+                  </p>
+                  <p>
+                    These are some of the things you can do with the API:
+                    <ul>
+                      <li>List all available plugins: <a href="/api/plugins">/api/plugins</a></li>
+                      <li>Get information about the default plugin: <a href="/api/plugins/default">/api/plugins/default</a></li>
+                      <li>Download the JSON-LD context used: <a href="/api/contexts/Results.jsonld">/api/contexts/Results.jsonld</a></li>
+                    </ul>
+
                   </p>
                   
                 </div>
-                
-              </div>
+            <div class="col-lg-6 ">
               <div class="panel panel-default">
-                <div class="panel-heading"><i class="fa fa-sign-in"></i> Follow us on <a href="http://www.github.com/gsi-upm/senpy">GitHub</a></div>
-              </div>
-              <div class="panel panel-default">
-                <div class="panel-heading"><i class="fa fa-child"></i> Enjoy.</div>
+                <div class="panel-heading">
+                Available Plugins
+                </div>
+                <div class="panel-body"><ul id=availablePlugins></ul></div>
               </div>
             </div>
             <div class="col-lg-6 ">
-              <div class="well">
-                <h2>Available Plugins</h2>
-                <div>
-                <span><ul id=availablePlugins></ul></span>
-                </div>
-                
+              <a href="http://senpy.readthedocs.io">
+              <div class="panel panel-default">
+                <div class="panel-heading"><i class="fa fa-book"></i> If you are new to senpy, you might want to read senpy's documentation</div>
+              </div>
+              </a>
+              <a href="http://www.github.com/gsi-upm/senpy">
+              <div class="panel panel-default">
+                <div class="panel-heading"><i class="fa fa-sign-in"></i> Feel free to follow us on GitHub</div>
+              </div>
+              </a>
+              <div class="panel panel-default">
+                <div class="panel-heading"><i class="fa fa-child"></i> Enjoy.</div>
               </div>
             </div>     
           </div>
         </div>
 
-        <div class="tab-pane" id="test">
+        <div class="tab-pane active" id="test">
           <div class="well">
             <form id="form" onsubmit="return getPlugins();" accept-charset="utf-8">
               <div id="inputswrapper">
@@ -81,30 +100,32 @@ I cannot believe it!</textarea></div>
                         <div id ="params">
                         </div>
                 </br>
-                <a id="preview" class="btn btn-lg btn-primary" href="#" onclick="load_JSON()">Analyse!</a>
+                <a id="preview" class="btn btn-lg btn-primary" onclick="load_JSON()">Analyse!</a>
                 <!--<button id="visualise" name="type" type="button">Visualise!</button>-->
+              </div>
             </form>
-              <span id="input_request"></span>
+          </div>
+            <span id="input_request"></span>
+            <div id="results-div">
               <ul class="nav nav-tabs" role="tablist">
                 <li role="presentation" class="active"><a class="active" href="#viewer">Viewer</a></li>
                 <li role="presentation"><a class="active" href="#raw">Raw</a></li>
               </ul>
-              <div class="tab-content">
+              <div class="tab-content" id="results-container">
                 
                 <div class="tab-pane active" id="viewer">
-                    <div id="content">
-                      <pre id="results"></pre>
-                    </div>
+                  <div id="content">
+                    <pre id="results" class="results"></pre>
+                  </div>
                 </div>
                 
                 <div class="tab-pane" id="raw">
-                    <div id="content">
-                       <pre id="jsonraw"></pre>
-                    </div>
+                  <div id="content">
+                    <pre id="jsonraw" class="results"></pre>
+                  </div>
                 </div>
               </div>
             </div>
-          </div>
         </div>
         <a href="http://www.gsi.dit.upm.es" target="_blank"><img class="center-block" src="static/img/gsi.png"/>  </a> 
 
diff --git a/senpy/version.py b/senpy/version.py
index c527fd0..1d5ec0d 100644
--- a/senpy/version.py
+++ b/senpy/version.py
@@ -1,5 +1,4 @@
 import os
-import subprocess
 import logging
 
 logger = logging.getLogger(__name__)
@@ -8,27 +7,9 @@ ROOT = os.path.dirname(__file__)
 DEFAULT_FILE = os.path.join(ROOT, 'VERSION')
 
 
-def git_version():
-    try:
-        res = subprocess.check_output(['git', 'describe',
-                                       '--tags', '--dirty']).decode('utf-8')
-        return res.strip()
-    except subprocess.CalledProcessError:
-        return None
-
-
 def read_version(versionfile=DEFAULT_FILE):
     with open(versionfile) as f:
         return f.read().strip()
 
 
-def write_version(version, versionfile=DEFAULT_FILE):
-    version = version or git_version()
-    if not version:
-        raise ValueError('You need to provide a valid version')
-    with open(versionfile, 'w') as f:
-        f.write(version)
-
-
-__version__ = git_version() or read_version()
-write_version(__version__)
+__version__ = read_version()
diff --git a/setup.cfg b/setup.cfg
index 178ba5f..c1b329b 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -7,3 +7,6 @@ test=pytest
 # finishing the imports. flake8 thinks that we're doing the imports too late,
 # but it's actually ok
 ignore = E402
+max-line-length = 100
+[bdist_wheel]
+universal=1
\ No newline at end of file
diff --git a/setup.py b/setup.py
index 9044fe3..7dee40a 100644
--- a/setup.py
+++ b/setup.py
@@ -1,7 +1,8 @@
 import pip
 from setuptools import setup
-from pip.req import parse_requirements
 # parse_requirements() returns generator of pip.req.InstallRequirement objects
+from pip.req import parse_requirements
+from senpy import __version__
 
 try:
     install_reqs = parse_requirements(
@@ -15,7 +16,6 @@ except AttributeError:
 install_reqs = [str(ir.req) for ir in install_reqs]
 test_reqs = [str(ir.req) for ir in test_reqs]
 
-from senpy import __version__
 
 setup(
     name='senpy',
diff --git a/tests/dummy_plugin/dummy.py b/tests/dummy_plugin/dummy.py
deleted file mode 100644
index 7ab4a2d..0000000
--- a/tests/dummy_plugin/dummy.py
+++ /dev/null
@@ -1,7 +0,0 @@
-from senpy.plugins import SentimentPlugin
-from senpy.models import Results
-
-
-class DummyPlugin(SentimentPlugin):
-    def analyse(self, *args, **kwargs):
-        return Results()
diff --git a/tests/dummy_plugin/dummy.senpy b/tests/dummy_plugin/dummy.senpy
deleted file mode 100644
index 996e614..0000000
--- a/tests/dummy_plugin/dummy.senpy
+++ /dev/null
@@ -1,7 +0,0 @@
-{
-    "name": "Dummy",
-    "module": "dummy",
-    "description": "I am dummy",
-    "author": "@balkian",
-    "version": "0.1"
-}
diff --git a/tests/plugins/dummy_plugin/dummy.py b/tests/plugins/dummy_plugin/dummy.py
new file mode 100644
index 0000000..6f3f091
--- /dev/null
+++ b/tests/plugins/dummy_plugin/dummy.py
@@ -0,0 +1,7 @@
+from senpy.plugins import SentimentPlugin
+
+
+class DummyPlugin(SentimentPlugin):
+    def analyse_entry(self, entry, params):
+        entry.text = entry.text[::-1]
+        yield entry
diff --git a/tests/plugins/dummy_plugin/dummy.senpy b/tests/plugins/dummy_plugin/dummy.senpy
new file mode 100644
index 0000000..ea0c405
--- /dev/null
+++ b/tests/plugins/dummy_plugin/dummy.senpy
@@ -0,0 +1,15 @@
+{
+    "name": "Dummy",
+    "module": "dummy",
+    "description": "I am dummy",
+    "author": "@balkian",
+    "version": "0.1",
+    "extra_params": {
+        "example": {
+            "@id": "example_parameter",
+            "aliases": ["example", "ex"],
+            "required": false,
+            "default": 0
+        }
+    }
+}
diff --git a/tests/plugins/dummy_plugin/dummy_required.senpy b/tests/plugins/dummy_plugin/dummy_required.senpy
new file mode 100644
index 0000000..3e361f6
--- /dev/null
+++ b/tests/plugins/dummy_plugin/dummy_required.senpy
@@ -0,0 +1,14 @@
+{
+    "name": "DummyRequired",
+    "module": "dummy",
+    "description": "I am dummy",
+    "author": "@balkian",
+    "version": "0.1",
+    "extra_params": {
+        "example": {
+            "@id": "example_parameter",
+            "aliases": ["example", "ex"],
+            "required": true
+        }
+    }
+}
diff --git a/tests/sleep_plugin/sleep.py b/tests/plugins/sleep_plugin/sleep.py
similarity index 51%
rename from tests/sleep_plugin/sleep.py
rename to tests/plugins/sleep_plugin/sleep.py
index bcc1cbe..510c2a9 100644
--- a/tests/sleep_plugin/sleep.py
+++ b/tests/plugins/sleep_plugin/sleep.py
@@ -1,5 +1,4 @@
 from senpy.plugins import SenpyPlugin
-from senpy.models import Results
 from time import sleep
 
 
@@ -7,6 +6,6 @@ class SleepPlugin(SenpyPlugin):
     def activate(self, *args, **kwargs):
         sleep(self.timeout)
 
-    def analyse(self, *args, **kwargs):
-        sleep(float(kwargs.get("timeout", self.timeout)))
-        return Results()
+    def analyse_entry(self, entry, params):
+        sleep(float(params.get("timeout", self.timeout)))
+        yield entry
diff --git a/tests/sleep_plugin/sleep.senpy b/tests/plugins/sleep_plugin/sleep.senpy
similarity index 100%
rename from tests/sleep_plugin/sleep.senpy
rename to tests/plugins/sleep_plugin/sleep.senpy
diff --git a/tests/test_blueprints.py b/tests/test_blueprints.py
index 6674992..2eaae64 100644
--- a/tests/test_blueprints.py
+++ b/tests/test_blueprints.py
@@ -25,6 +25,8 @@ class BlueprintsTest(TestCase):
         self.dir = os.path.join(os.path.dirname(__file__), "..")
         self.senpy.add_folder(self.dir)
         self.senpy.activate_plugin("Dummy", sync=True)
+        self.senpy.activate_plugin("DummyRequired", sync=True)
+        self.senpy.default_plugin = 'Dummy'
 
     def assertCode(self, resp, code):
         self.assertEqual(resp.status_code, code)
@@ -34,12 +36,12 @@ class BlueprintsTest(TestCase):
         Calling with no arguments should ask the user for more arguments
         """
         resp = self.client.get("/api/")
-        self.assertCode(resp, 404)
+        self.assertCode(resp, 400)
         js = parse_resp(resp)
         logging.debug(js)
-        assert js["status"] == 404
+        assert js["status"] == 400
         atleast = {
-            "status": 404,
+            "status": 400,
             "message": "Missing or invalid parameters",
         }
         assert check_dict(js, atleast)
@@ -56,6 +58,28 @@ class BlueprintsTest(TestCase):
         assert "@context" in js
         assert "entries" in js
 
+    def test_analysis_extra(self):
+        """
+        Extra params that have a default should
+        """
+        resp = self.client.get("/api/?i=My aloha mohame&algo=Dummy")
+        self.assertCode(resp, 200)
+        js = parse_resp(resp)
+        logging.debug("Got response: %s", js)
+        assert "@context" in js
+        assert "entries" in js
+
+    def test_analysis_extra_required(self):
+        """
+        Extra params that have a required argument that does not
+        have a default should raise an error.
+        """
+        resp = self.client.get("/api/?i=My aloha mohame&algo=DummyRequired")
+        self.assertCode(resp, 400)
+        js = parse_resp(resp)
+        logging.debug("Got response: %s", js)
+        assert isinstance(js, models.Error)
+
     def test_error(self):
         """
         The dummy plugin returns an empty response,\
@@ -102,7 +126,7 @@ class BlueprintsTest(TestCase):
         js = parse_resp(resp)
         logging.debug(js)
         assert "@id" in js
-        assert js["@id"] == "Dummy_0.1"
+        assert js["@id"] == "plugins/Dummy_0.1"
 
     def test_default(self):
         """ Show only one plugin"""
@@ -111,7 +135,7 @@ class BlueprintsTest(TestCase):
         js = parse_resp(resp)
         logging.debug(js)
         assert "@id" in js
-        assert js["@id"] == "Dummy_0.1"
+        assert js["@id"] == "plugins/Dummy_0.1"
 
     def test_context(self):
         resp = self.client.get("/api/contexts/context.jsonld")
diff --git a/tests/test_client.py b/tests/test_client.py
index 2690d88..2597258 100644
--- a/tests/test_client.py
+++ b/tests/test_client.py
@@ -9,9 +9,10 @@ from senpy.models import Results, Error
 
 
 class Call(dict):
-
     def __init__(self, obj):
         self.obj = obj.jsonld()
+        self.status_code = 200
+        self.content = self.json()
 
     def json(self):
         return self.obj
@@ -29,14 +30,14 @@ class ModelsTest(TestCase):
         with patch('requests.request', return_value=success) as patched:
             resp = client.analyse('hello')
             assert isinstance(resp, Results)
-        patched.assert_called_with(url=endpoint + '/',
-                                   method='GET',
-                                   params={'input': 'hello'})
+        patched.assert_called_with(
+            url=endpoint + '/', method='GET', params={'input': 'hello'})
         error = Call(Error('Nothing'))
         with patch('requests.request', return_value=error) as patched:
             resp = client.analyse(input='hello', algorithm='NONEXISTENT')
             assert isinstance(resp, Error)
-        patched.assert_called_with(url=endpoint + '/',
-                                   method='GET',
-                                   params={'input': 'hello',
-                                           'algorithm': 'NONEXISTENT'})
+        patched.assert_called_with(
+            url=endpoint + '/',
+            method='GET',
+            params={'input': 'hello',
+                    'algorithm': 'NONEXISTENT'})
diff --git a/tests/test_extensions.py b/tests/test_extensions.py
index 5e1faa0..7c89aca 100644
--- a/tests/test_extensions.py
+++ b/tests/test_extensions.py
@@ -16,7 +16,7 @@ from unittest import TestCase
 
 class ExtensionsTest(TestCase):
     def setUp(self):
-        self.app = Flask("test_extensions")
+        self.app = Flask('test_extensions')
         self.dir = os.path.join(os.path.dirname(__file__))
         self.senpy = Senpy(plugin_folder=self.dir,
                            app=self.app,
@@ -45,7 +45,7 @@ class ExtensionsTest(TestCase):
             'requirements': ['noop'],
             'version': 0
         }
-        root = os.path.join(self.dir, 'dummy_plugin')
+        root = os.path.join(self.dir, 'plugins', 'dummy_plugin')
         name, module = self.senpy._load_plugin_from_info(info, root=root)
         assert name == 'TestPip'
         assert module
@@ -55,7 +55,7 @@ class ExtensionsTest(TestCase):
     def test_installing(self):
         """ Enabling a plugin """
         self.senpy.activate_all(sync=True)
-        assert len(self.senpy.plugins) == 2
+        assert len(self.senpy.plugins) >= 3
         assert self.senpy.plugins["Sleep"].is_activated
 
     def test_disabling(self):
@@ -75,11 +75,12 @@ class ExtensionsTest(TestCase):
     def test_noplugin(self):
         """ Don't analyse if there isn't any plugin installed """
         self.senpy.deactivate_all(sync=True)
-        self.assertRaises(Error, partial(self.senpy.analyse,
-                                         input="tupni"))
-        self.assertRaises(Error, partial(self.senpy.analyse,
-                                         input="tupni",
-                                         algorithm='Dummy'))
+        self.assertRaises(Error, partial(self.senpy.analyse, input="tupni"))
+        self.assertRaises(Error,
+                          partial(
+                              self.senpy.analyse,
+                              input="tupni",
+                              algorithm='Dummy'))
 
     def test_analyse(self):
         """ Using a plugin """
@@ -88,17 +89,20 @@ class ExtensionsTest(TestCase):
         r1 = self.senpy.analyse(
             algorithm="Dummy", input="tupni", output="tuptuo")
         r2 = self.senpy.analyse(input="tupni", output="tuptuo")
-        assert r1.analysis[0].id[:5] == "Dummy"
-        assert r2.analysis[0].id[:5] == "Dummy"
+        assert r1.analysis[0] == "plugins/Dummy_0.1"
+        assert r2.analysis[0] == "plugins/Dummy_0.1"
+        assert r1.entries[0].text == 'input'
 
     def test_analyse_error(self):
         mm = mock.MagicMock()
-        mm.analyse.side_effect = Error('error on analysis', status=900)
+        mm.analyse_entry.side_effect = Error('error on analysis', status=900)
         self.senpy.plugins['MOCK'] = mm
         resp = self.senpy.analyse(input='nothing', algorithm='MOCK')
         assert resp['message'] == 'error on analysis'
         assert resp['status'] == 900
         mm.analyse.side_effect = Exception('generic exception on analysis')
+        mm.analyse_entry.side_effect = Exception(
+            'generic exception on analysis')
         resp = self.senpy.analyse(input='nothing', algorithm='MOCK')
         assert resp['message'] == 'generic exception on analysis'
         assert resp['status'] == 500
@@ -110,8 +114,7 @@ class ExtensionsTest(TestCase):
         assert self.senpy.filter_plugins(name="Dummy", is_activated=True)
         self.senpy.deactivate_plugin("Dummy", sync=True)
         assert not len(
-            self.senpy.filter_plugins(
-                name="Dummy", is_activated=True))
+            self.senpy.filter_plugins(name="Dummy", is_activated=True))
 
     def test_load_default_plugins(self):
         senpy = Senpy(plugin_folder=self.dir, default_plugins=True)
diff --git a/tests/test_models.py b/tests/test_models.py
index 5ced7f3..df48c79 100644
--- a/tests/test_models.py
+++ b/tests/test_models.py
@@ -3,20 +3,25 @@ import logging
 import jsonschema
 
 import json
+import rdflib
 from unittest import TestCase
-from senpy.models import Entry, Results, Sentiment, EmotionSet, Error
+from senpy.models import (Emotion,
+                          EmotionAnalysis,
+                          EmotionSet,
+                          Entry,
+                          Error,
+                          Results,
+                          Sentiment)
 from senpy.plugins import SenpyPlugin
 from pprint import pprint
 
 
 class ModelsTest(TestCase):
     def test_jsonld(self):
-        prueba = {"id": "test",
-                  "analysis": [],
-                  "entries": []}
+        prueba = {"id": "test", "analysis": [], "entries": []}
         r = Results(**prueba)
         print("Response's context: ")
-        pprint(r.context)
+        pprint(r._context)
 
         assert r.id == "test"
 
@@ -30,14 +35,11 @@ class ModelsTest(TestCase):
         assert "id" not in j
 
         r6 = Results(**prueba)
-        e = Entry({
-            "@id": "ohno",
-            "nif:isString": "Just testing"
-        })
+        e = Entry({"@id": "ohno", "nif:isString": "Just testing"})
         r6.entries.append(e)
         logging.debug("Reponse 6: %s", r6)
-        assert ("marl" in r6.context)
-        assert ("entries" in r6.context)
+        assert ("marl" in r6._context)
+        assert ("entries" in r6._context)
         j6 = r6.jsonld(with_context=True)
         logging.debug("jsonld: %s", j6)
         assert ("@context" in j6)
@@ -113,5 +115,35 @@ class ModelsTest(TestCase):
         s = str(r)
         assert "_testing" not in s
 
-    def test_frame_response(self):
+    def test_turtle(self):
+        """Any model should be serializable as a turtle file"""
+        ana = EmotionAnalysis()
+        res = Results()
+        res.analysis.append(ana)
+        entry = Entry(text='Just testing')
+        eSet = EmotionSet()
+        emotion = Emotion()
+        entry.emotions.append(eSet)
+        res.entries.append(entry)
+        eSet.onyx__hasEmotion.append(emotion)
+        eSet.prov__wasGeneratedBy = ana.id
+        triples = ('ana a :Analysis',
+                   'entry a :entry',
+                   '      nif:isString "Just testing"',
+                   '      onyx:hasEmotionSet eSet',
+                   'eSet a onyx:EmotionSet',
+                   '     prov:wasGeneratedBy ana',
+                   '     onyx:hasEmotion emotion',
+                   'emotion a onyx:Emotion',
+                   'res a :results',
+                   '    me:AnalysisInvoloved ana',
+                   '    prov:used entry')
+
+        t = res.serialize(format='turtle')
+        print(t)
+        g = rdflib.Graph().parse(data=t, format='turtle')
+        assert len(g) == len(triples)
+
+    def test_convert_emotions(self):
+        """It should be possible to convert between different emotion models"""
         pass
diff --git a/tests/test_plugins.py b/tests/test_plugins.py
index 734e643..946f77e 100644
--- a/tests/test_plugins.py
+++ b/tests/test_plugins.py
@@ -77,6 +77,7 @@ class PluginsTest(TestCase):
         })
         a.activate()
 
+        assert a.shelf_file == self.shelf_file
         res1 = a.analyse(input=1)
         assert res1.entries[0].nif__isString == 1
         res2 = a.analyse(input=1)
@@ -103,3 +104,19 @@ class PluginsTest(TestCase):
         assert b.sh['a'] == 'fromA'
         b.sh['a'] = 'fromB'
         assert b.sh['a'] == 'fromB'
+
+    def test_extra_params(self):
+        ''' Should be able to set extra parameters'''
+        a = ShelfDummyPlugin(info={
+            'name': 'shelve',
+            'version': 'test',
+            'shelf_file': self.shelf_file,
+            'extra_params': {
+                'example': {
+                    'aliases': ['example', 'ex'],
+                    'required': True,
+                    'default': 'nonsense'
+                }
+            }
+        })
+        assert 'example' in a.extra_params
diff --git a/version.sh b/version.sh
new file mode 100755
index 0000000..c8d1f03
--- /dev/null
+++ b/version.sh
@@ -0,0 +1,2 @@
+#!/bin/sh
+VERSION=$(git describe --long --tags --dirty)