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   Re: [xml-dev] XPath/XSLT 2.0 concerns

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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



Jeni Tennison


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