= Ontologies =

we need a "generic data ontology" with classes and properties that the adapters will usually return. These are classes like file, email, folder, appointment. and properies like title, fulltext, etc.

This main data ontology has to be extensible (at best, a protege project) and uploaded at a correct url.

= special ontologies =
each datasource may bring a special ontology with it. How about a method getontology in ApertureDataSource?