W3C home > Mailing lists > Public > xmlschema-dev@w3.org > July 2006

RE: Xml Schema profile

From: Michael Kay <mike@saxonica.com>
Date: Wed, 19 Jul 2006 19:55:20 +0100
To: <lists@jeffrafter.com>, "'Paul Kiel'" <paul@hr-xml.org>
Cc: <xmlschema-dev@w3c.org>
Message-ID: <00e601c6ab64$e2251c40$6401a8c0@turtle>

> Actually, support for redefine is fairly surprising.

You mean, the level of support is surprisingly high?

Yes, I'm mildly surprised that I support it ;-). 

> There 
> are issues that you can run into if you use a strange mix of 
> namespaces and redefining of chameleon components. In the 
> general case we have seen a lot of improvement in the past year.

Saxon basically imposes the rule, in managing its schema cache, that once a
type has been used then it can't be redefined. Using a type means using it
for validating an instance or for compiling a query or stylesheet. This is a
bit of a blunt instrument, but it seems to eliminate most of the potential
problems. The rule ensures that all references to a type with a given name
are referring to the same type.

Michael Kay
Received on Wednesday, 19 July 2006 18:55:40 UTC

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