Subject: RE: [xsl] [XSLT 2.0] Checking that an element's value has the desired datatype? From: "Michael Kay" <mike@xxxxxxxxxxxx> Date: Tue, 17 Oct 2006 12:52:23 +0100 |
> As best I can tell, the functionality of Schematron + xPath > 2.0 is a superset of XML Schemas (and RelaxNG). Yes, as far as testing validity is concerned, that's almost certainly true. Any integrity constraint can be expressed as a query that returns true or false. Remember however: (a) a schema is more than a yes/no validity checking function (b) some constraints are very convenient to express in the form of a grammar, and these constraints are far less easy to express in terms of XPath queries (c) XML schema is carefully designed so that its constraints can be evaluated in a single sequential pass through the document, without building a tree. Michael Kay http://www.saxonica.com/
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