Which semantics?

Sorry for me being so ignorant. But what could be called 'semantic' (in the
sense of 'meaning', I suppose) for the current frameworks, at least the
couple I know, available for ontologies of some kind if they could assert
between their instances which statements and resources are equivalent
(being them in a different language/encoding or different 'contextual'
terms for the same subjects for example).

Another important lack of 'semantics' is ordering (temporal or whatsoever)
where a statement or resource should be treated at least in relation to
their previous or following elements.

If my last posts where so blurry is because I try to address some of this
issues, besides others, trying no to fall in the promise that adhering to
one format will free us all of any interoperability hassles. Remember a
similar promise from XML: "All we have to do is share DTDs and
interoperate". I'll still trying to give the format a twist (RDF Quads) but
I'll publish a Google Document open for comments.

Best,
Sebastián.