Heres what the OED (Oxford English Dictionary) has to say on the subject
semantics:- relating to meaning
behaviour:- Conduct or course of action ...handling, disposition of..
schemata:- Any one of certain forms or rules of the 'productive imagination'
through which the understanding is able to apply its 'catagories' to the
manifold of sense-perception in the process of realizing knowledge or
experience. (Now that really clarifies the meaning of that word!!!<g>)
ontologies:- Studies pertaining to the nature of being or the essence of
things, or to being in the abstract.
taxonomy:-That particular branch of science that relates to classification.
(Now that one I knew!!)
So according to the OED style sheets handle both semantics and and behaviour