calling XPath extensions "EXSLT"

Something that has bugged me for a while is the fact that we call everything
"EXSLT" and refer to it all as a set of extensions to XSLT.  Quite a bit of
EXSLT's function library is actually just extensions to XPath, and doesn't
require access to an XSLT context.

I would like to have the documentation change in such a way that implementers 
are encouraged to think of the applicable extensions as being XPath 
extensions, not just XSLT extensions. This could be purely editorial changes 
on the website, or perhaps we could also establish more namespaces, like
http://expath.org/dates-and-times, which would be treated equivalently to 
their exslt.org counterparts, but only be usable with the functions that 
aren't XSLT-specific.

Thoughts?