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RE: [xml-dev] NVDL: A Disruptive Technology

From: "Michael Kay" <mike@--------.--->
To: "'Rick Jelliffe'" <rjelliffe@-------.---.-->,"'XML Developers List'" <xml-dev@-----.---.--->
Date: 5/13/2008 8:34:00 AM
> > An XML schema defines rules for a class of XML documents.
> >   
> Under that definition, doesn't XSD fail?   It defines rules for a 
> namespace not a class of documents.

Well, I wasn't intending it as a rigorous definition, but I think it's
defensible.

I don't know why you think XSD defines rules for a namespace. A (XSD) schema
defines rules for a set of named elements and attributes. In the concrete
syntax the rules are organized by namespace, but they aren't confined to a
single namespace.

It's true that XSD (intentionally) doesn't treat the document as the primary
unit of validation. But it still describes rules for a class of documents,
namely those rooted at one of the elements defined in the schema.

Anyway, I wasn't really talking about XSD or about any schema language in
particular. I was just arguing against the thesis that variety is good; in
my view it is a necessary evil caused by the inadequacies of the currently
available languages, starting with DTDs.

Michael Kay


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