C14N .vs. XML Schema

A schema represented in XML Schema can have default values, which 
affect the information set and thus C14N.

Suppose that this schema is referenced via a URI.  In XML Schema, 
the means used to locate appropriate schemas are processor and 
application dependent.  Some schema-aware processors use the 
referenced schema.  However, other schema-aware processors 
may use different schemas, which may contain different defaults.  
Therefore, the result of C14N would be processor and application 
dependent.  Is this acceptable for digital signature?

Cheers,

International University of Japan, Research Institute &
IBM Tokyo Research Lab 


MURATA Makoto