[Interest] Restricting QXmlQuery to QPath 2.0

[Elvis Stansvik]

Hi folks,

I'm considering using QtXmlPatterns, but I need to be able to restrict
queries to only accept XPath 2.0 expressions, not the full XQuery 1.0
language.

This seems impossible at the moment; QXmlQuery supports either XQuery10 or
XSLT20 as values for queryLanguage. However, the QueryLanguage enum has a
hidden value XPath20 for internal purposes. I took a quick look, and this
seems to be used internally when parsing of XPath 2.0 expressions in XSLT
2.0.

I'm hoping someone intimately familiar with the query code can answer:
Would it be possible/feasible to add third public mode to the query parser,
one in which only XPath 2.0 is accepted? Or is this too much work / out of
scope?

I haven't looked too closely at the code, but XPath 2.0 is a subset of
XQuery 1.0, so my hope is that it would not be an insurmountable effort to
add this. But I may be wrong. Also, I suspect QtXmlPatterns might not be
actively worked on except for bugfixing?

Cheers,
Elvis
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