Subject: RE: [xsl] Request help in understanding: node instance of schema-element(node) From: "Michael Kay" <mike@xxxxxxxxxxxx> Date: Sat, 26 Jan 2008 22:55:56 -0000 |
> Apparently I am not correctly understanding this XPath statement: > > if (//test instance of schema-element(test)) then > //test * 2 > else 'Error' > > My understanding of the XPath is this: "If the <test> element > in the input document conforms to the declaration of test in > the XML Schema then multiply its value by 2, otherwise output Error." See my XPath 2.0 Programmer's Reference page 287 regarding "instance of": "It's important to remember, whether you are testing atomic values or nodes, that the "instance of" operator is testing whether the value has a label that identifies it as a member of the specified type. It isn't testing whether the value would be a valid member of that type if the label were changed." It goes on: "the fact that validation against this type would succeed is not enough; the validation must actually have been done, so that the required type annotation is present on the node." This is not that dissimilar from other languages: in Java, ("2008-01-25" instanceof Date) returns false. > > What am I doing wrong? > > I am using the schema-aware version of SAXON, version > 8.9.0.4j. Below is the stylesheet, XML Schema, and XML document. > You haven't shown the bit that you did wrong, which was almost certainly to run the stylesheet against an unvalidated input document. With Saxon, you request validation by using an option on the command line (-val for 8.9.0.4, -val:strict for 9.0.0.n) (or of course via the Java API). With Altova, you request validation by including an xsi:schemaLocation attribute in the instance document. Michael Kay http://www.saxonica.com/
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