RE: [xml-dev] Victory has been declared in the schema wars ...

• From: "Costello, Roger L." <costello@...>
• To: <xml-dev@...>
• Date: Wed, 29 Nov 2006 06:32:28 -0500

Rick Jelliffe wrote:

[Assertion] grammars are a bad foundation

[Assertion] Schemas should be based on paths

These are two powerful assertions Rick.

Would you explain why grammar-based languages (e.g., DTD, XSD, RNG) are
a bad foundation?  A grammar-based language tells an instance document
author what tags are allowed, how those tags may be arranged, and the
datatypes of the data.  Isn't that what we want from a schema language?
Shouldn't that information serve as the foundation for a schema?

Also, would you explain why paths (XPaths) provide a more suitable
foundation?

Thanks.

/Roger