SW Ontologies ≠ a central, big ontology!

• The “ethos” of the Semantic Web is on sharing, ie, sharing ontologies (small or large)

• A huge, central ontology would be unmanageable

• The practice:

• • SW applications using ontologies always mix large number of ontologies and vocabularies (FOAF, DC, and others)
  • the real advantage comes from this mix: that is also how new relationships may be discovered
  • applications in an area can agree on their vocabularies: and that is enough; a global consistency may not be necessary