rdf semantics and timelessly true

Hi Pat,

Pat Hayes wrote:
> Its not impossible, and in a strong sense this is required by the current RDF semantics, which treats all RDF assertions as timelessly true.

Can you refine / expand on this please? I'd presumed RDF to have no 
consideration of time - e.g time-less; as opposed to being true for all 
time (timeless).

TIA,

Nathan