xml-dev - Re: Override default in a schema by more specific default in anothersche

[ht@cogsci.ed.ac.uk (Henry S. Thompson)]

"Tolkin, Steve" <Steve.Tolkin@FMR.COM> writes:

> Suppose I have a base schema named e.g. base.xsd.  This sets the default
> value for an attribute to e.g. base_value.  I know I can override this in
> the instance document, e.g. foo.xml.  But what I want is to provide a more
> specific default value in another another schema document, e.g. to org_value
> in org.xsd.  Can I do this?  If I can do two levels I assume I can do n
> levels, e.g. make the default my_value in my.xsd, etc.

This functionality is not supported by XML Schema.  All derivation in
XML Schema is based on restriction or extension, and it's not clear to 
me what this would mean in this case.  You _can_ restrict a
declaration w/o a default to have one, but what does it mean to be a
'more specific' default?

ht
-- 
  Henry S. Thompson, HCRC Language Technology Group, University of Edinburgh
          W3C Fellow 1999--2001, part-time member of W3C Team
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