diff --git a/classifier/README.txt b/classifier/README.txt
index 70a656b..f48ab40 100644
--- a/classifier/README.txt
+++ b/classifier/README.txt
@@ -27,7 +27,7 @@ configuration):
   >>> concepts, resources, views = t.setup()
 
   >>> len(concepts) + len(resources)
-  16
+  18
 
 
 Fin de partie
diff --git a/classifier/base.py b/classifier/base.py
index caddcc2..55a95f8 100644
--- a/classifier/base.py
+++ b/classifier/base.py
@@ -29,7 +29,8 @@ from zope.event import notify
 from zope.interface import implements
 from zope.traversing.api import getName, getParent
 
-from loops.classifier.interfaces import IClassifier
+from loops.classifier.interfaces import IClassifier, IExtractor, IAnalyzer
+from loops.classifier.interfaces import IInformationSet, IStatement
 from loops.common import AdapterBase, adapted
 from loops.interfaces import IResource, IConcept
 from loops.resource import Resource
@@ -47,6 +48,45 @@ class Classifier(AdapterBase):
     implements(IClassifier)
     adapts(IConcept)
 
-    _adapterAttributes = ('context', '__parent__',)
     _contextAttributes = list(IClassifier) + list(IConcept)
 
+    def process(self, resource):
+        pass
+
+    def assignConcept(self, statement):
+        pass
+
+
+class Extractor(object):
+
+    implements(IExtractor)
+    adapts(IResource)
+
+    def __init__(self, context):
+        self.context = context
+
+    def extractInformationSet(self):
+        return InformationSet()
+
+
+class Analyzer(object):
+
+    implements(IAnalyzer)
+
+    def extractStatements(self,informationSet):
+        return []
+
+
+class InformationSet(dict):
+
+    implements(IInformationSet)
+
+
+class Statement(object):
+
+    implements(IStatement)
+
+    subject = None
+    predicate = None
+    object = None
+    relevance = 100
diff --git a/classifier/configure.zcml b/classifier/configure.zcml
index 0e10ce6..7d96f8b 100644
--- a/classifier/configure.zcml
+++ b/classifier/configure.zcml
@@ -16,4 +16,16 @@
              set_schema="loops.classifier.interfaces.IClassifier" />
   </zope:class>
 
+  <zope:adapter factory="loops.classifier.base.Extractor"
+                trusted="True" />
+
+  <zope:class class="loops.classifier.base.Extractor">
+    <require permission="zope.View"
+             interface="loops.classifier.interfaces.IExtractor" />
+    <require permission="zope.ManageContent"
+             set_schema="loops.classifier.interfaces.IExtractor" />
+  </zope:class>
+
+  <zope:utility factory="loops.classifier.base.Analyzer" />
+
 </configure>
diff --git a/classifier/interfaces.py b/classifier/interfaces.py
index 49769d8..8a0d513 100644
--- a/classifier/interfaces.py
+++ b/classifier/interfaces.py
@@ -29,13 +29,72 @@ from loops.util import _
 
 
 class IClassifier(Interface):
-    """
+    """ An object that is able to analyze a resource and identify the
+        concepts to assign.
     """
 
-    providerName = schema.TextLine(
-            title=_(u'Provider name'),
-            description=_(u'The name of a utility that provides the '
-                           'external objects; default is a directory '
-                           'collection provider'),
-            required=False)
+    analyzer = schema.TextLine(
+        title=_(u'Analyzer'),
+        description=_(u'Name of a utility that is able to analyze '
+                'the resources assigned to this classifier.'),
+        default=u'',
+        required=False)
+
+    options = schema.List(
+        title=_(u'Options'),
+        description=_(u'Additional settings...'),
+        value_type=schema.TextLine(),
+        default=[],
+        required=False)
+
+    def process(resource):
+        """ Do all that is needed to classify the resource given.
+        """
+
+    def assignConcept(statement):
+        """ Assign a concept representing the object of the statement
+            given to the statement's subject, using the statement's
+            predicate.
+        """
+
+
+class IExtractor(Interface):
+    """ Adapter for extracting an information set from a resource.
+    """
+
+    def extractInformationSet():
+        """ Return an information set based on the resource given.
+        """
+
+
+class IAnalyzer(Interface):
+    """ Utility that is able to analyze an information set and
+        provide a collection of statements about it.
+    """
+
+    def extractStatements(informationSet):
+        """ Return a collection of statements derived from the
+            information set given.
+        """
+
+
+class IInformationSet(Interface):
+    """ A mapping or collection of key/value pairs; the keys are usually the
+        names of information elements, the values may be simple strings,
+        structured resources (e.g. XML documents), files providing such strings
+        or documents, or another kind of objects. The analyzer that is
+        fed with this information set must know what to do with it.
+    """
+
+
+class IStatement(Interface):
+    """ Represents a subject-predicate-object triple. These attributes
+        may be strings denoting the real
+    """
+
+    subject = Attribute('Subject of the Statement')
+    predicate = Attribute('Predicate of the Statement')
+    object = Attribute('Object of the Statement')
+    relevance = Attribute('A number denoting the relevance or correctness '
+                    'of the statement')
 
diff --git a/classifier/testsetup.py b/classifier/testsetup.py
index f34f6f7..a20af82 100644
--- a/classifier/testsetup.py
+++ b/classifier/testsetup.py
@@ -8,7 +8,8 @@ import os
 from zope import component
 
 from loops import util
-from loops.interfaces import IFile, IExternalFile
+from loops.classifier.base import Classifier, Extractor, Analyzer
+from loops.classifier.interfaces import IClassifier, IAnalyzer
 from loops.concept import Concept
 from loops.resource import Resource
 from loops.knowledge.setup import SetupManager as KnowledgeSetupManager
@@ -28,6 +29,17 @@ class TestSite(BaseTestSite):
         concepts, resources, views = self.baseSetup()
 
         tType = concepts.getTypeConcept()
+        tClassifier = addAndConfigureObject(concepts, Concept, 'classifier',
+                                title=u'Classifier', conceptType=tType,
+                                typeInterface=IClassifier)
+
+        component.provideAdapter(Classifier)
+        fileClassifier = addAndConfigureObject(concepts, Concept,
+                                'fileclassifier', title=u'File Classifier',
+                                conceptType=tClassifier)
+
+        component.provideAdapter(Extractor)
+        component.provideUtility(Analyzer, IAnalyzer)
 
         self.indexAll(concepts, resources)
         return concepts, resources, views
diff --git a/common.py b/common.py
index 48698a7..fc8a564 100644
--- a/common.py
+++ b/common.py
@@ -56,7 +56,7 @@ class AdapterBase(object):
 
     adapts(IConcept)
 
-    _adapterAttributes = ('context', '__parent__', )
+    _adapterAttributes = ('context', '__parent__',)
     _contextAttributes = list(IConcept)
 
     def __init__(self, context):