A mechanism for locating RNG schemas

[Steinar Bang <sb@dod.no>]

The Relax NG schema language, doesn't define a standard way for
associating an XML document with a Relax NG schema.

A bit of the reasoning behind this, can be found here:
	http://www.thaiopensource.com/relaxng/design.html#section:17

For his Emacs XML mode, nXML, James Clark plans to implement
association between document and schema, in the manner described in
this email:
	http://groups.yahoo.com/group/emacs-nxml-mode/message/259

The email describes an XML format that can be used to locate schemas
for documents, in a myriad ways.  The XML format can be chained in the
same way as OASIS catalogs, and OASIS XML Catalogs, so a similar
structure to what the debian policy document describes for DTDs, can
be adopted for locating Relax NG schemas.


- Steinar