Another tentative version of the RELAX NG schemas for XML Signature Syntax and Processing (Second Edition)

Dear colleagues,

Attached please find a revised version of the RELAX NG schemas for 
XML Signature Syntax and Processing (Second Edition).

Unlike the XSD version, it is possible to easily customize the attached 
xmldsig-core-schema.rnc for a particular application of XML Signature.
Depending on the value of @Algorithm, different content models are
specified.

I plan to combine this schema and the Open Packaging Convention (ISO/IEC
29500-2) schema so as to impose tighter constraints.  This experiment 
is likely to require some changes to these schemas, but I do not think 
that the changes will be drastic.

Cheers,
Makoto