updated StandardsRegExt internally available

[Ray Plante]

Hi folks,

I've updated both the specification and the schema documents for the 
proposed <schema> element I described in my previous post.  I've 
also created a new example using it.  You can find all these on the on 
the StandardsRegExt page 
(http://www.ivoa.net/cgi-bin/twiki/bin/view/IVOA/StandardsRegExt).

If I can get sufficient endorsement for the new element, I'll have 
this uploaded to the repository for wider review.  

cheers,
Ray