[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] RE: Testability and Schema validity
From: Mike Champion [mailto:mc@x...] Sent: Monday, May 26, 2003 2:17 PM Subject: Testability and Schema validity ... For example, consider a purchase order format definition. ... But a real test regime will require constraints that aren't expressible in any XML schema language AFAIK: We noted this issue with HTML forms, and added the ability to bind properties to instance nodesets via XPath expressions. XForms offers a "constraint" property, which is an XPath expression that must be true in order for the nodeset to be valid. The constraints on all nodes that are submitted must be true, and the resulting instance must be valid according to the Schema, before the form instance is submitted. The live data constraints you mentioned ("approved by", "currently in stock", etc) can be retrieved from within XForms while the form is being filled out, without having to retrieve the entire host document. Data that is not part of the submitted instance can be sent along with the host document as additional instances, or pulled in later, or received as a response to a submission of some other instance. Finally, XForms allow the declaration of XPath extension functions, so a client can also offer additional XPath functions that can be used in constraint expressiona.
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