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RE: Classroom critique of XML Schema 1.1

From: Costello, Roger L. <costello@mitre.org>
Date: Sat, 19 Mar 2011 13:10:30 -0400
To: "xmlschema-dev@w3.org" <xmlschema-dev@w3.org>
Message-ID: <9E51F88D5247B648908850C35A3BBB500530221C4A@IMCMBX3.MITRE.ORG>
Hi Andrew,

> Don't forget that XSD can stream xml to validate it, hence the 'look
> down' restriction.  Full XPath requires the whole document in memory.

That's an excellent point.

However, the XML Schema language should not force a schema designer to always look down just so that implementations can support streaming. If it is important for a schema designer to make use of streaming then he will design his XML Schema <assert> elements to always look down, but if streaming is not important to him then his <assert> elements should be able to look anywhere, including across documents.

/Roger
Received on Saturday, 19 March 2011 17:11:03 GMT

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