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Hi David! >> I've heard talk about an XSLT "lint" that would catch this kind of >> error with knowledge of the input schema/dtd but without static >> typing built deep into XLST or reference to types in the >> stylesheet. Is such a thing just a thought experiment, or has >> anyone done such a thing? > > Yes, I have (probably not the one you've heard of though since I've > never made it public). It works along the following lines: > > Transform the input stylesheet into a new xml document where each > XPath expression and pattern has been turned into an XML structure. > Apply a second transform to this document which also reads a schema > (RELAX NG in my case). The result of this transformation is an > enumeration of patterns and XPath expressions found in the input > stylesheet, which can never match or select nodes in a document > which is valid against the input schema. Wow, that sounds great! Can you be persuaded to make it public, or is it something that you're building into a commercial tool? > As you point out this is done without any schema or static typing > knowledge built into XSLT. So this kind of static checking is really > not an argument to build schema support into XSLT. And it's something that's used at *design time*, to help the programmer create a better stylesheet, rather than at *run time* to hide the mistakes that they've made. That seems really beneficial to me. Cheers, Jeni --- Jeni Tennison http://www.jenitennison.com/
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