Subject: RE: [xsl] testing for string and number in XSLT 2.0 was Re: [xsl] Test For Numeric Values? From: "Michael Kay" <mike@xxxxxxxxxxxx> Date: Fri, 8 Apr 2005 14:17:59 +0100 |
> Until now I was under the impression that the "instance of" operator > is usable only if the value has been type-annotated as result of > validation against a specific xml schema (as described on page 287 of > the XPath 2.0 book), (which may not be the case with a significant > part of all transformations written and used in the real world). > > Is my understanding of the applicability of the "instance of" > operator wrong ? It's incomplete... For atomic values, you can simply do things like 123 instance of xs:boolean => false "123" instance of xs:string => true Also for nodes, you can do $node instance of comment() $node instance of element(para) neither of which requires a schema. Michael Kay http://www.saxonica.com/
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