Sitemap independence from the files it points to

Hi Joshua,

I'm trying to make the sitemmap independent from the files it references,
by using a variable or constant specifier. Kind of like NX_XSL path
constant defined in the index.php file.

This would then be used in the builders to prepend the path. If you want
to use relative paths, fine, just leave it blank. Otherwise, the constant
will allow you to use absolute paths, and move the directory that contains
all the stuff that sitemap references. I've already had to update all the
paths several times, and now that the sitemaps can get split up, it will
get harder.

Just thought I'd check in with you to see if you have thought of this
before. I was thinking it might make sense to have a sitemap variable or
something, but that didn't sit right with me.

Alby