For now: Ontology = Tagspace

In the context of the Metajizer, the space of all tags is called the ontology.

Overblown but close

This is a bit overblown a term, since there is not much semantic information other than "[Content|DOC-9433] resources can have these Attributes, which can have these Values. It still makes sense, since

• It stresses the point that we are actually gathering semantic information about our Content

• The other term that is used in this context, Taxonomy, is normally associated with a strictly-hierarchic classification (even if it doesn't mean that by its definition) and could thus be misleading.