Retrofitting XSLT2 into Xalan 2

[Foxyshadis]

I'm wondering just how similar the codebases for XalanJ2 vs. 3 are shaping up. In particular, I'm wondering if it would be possible at all to migrate backward XSLT2 features, like for-each-group or regular expressions, as extension elements into XalanJ 2. I know the low level requirements of the two are somewhat different, but I don't know how that effecs the various elements.

I haven't kept up with the development of the xslt20 branch at all, and it's been almost a year since I actively worked on extensions to the current one, so I feel a bit out of my league at the moment. However, if I become interested enough in the topic, I might try out something along these lines. If successful, it would beat abusing the nodeset/evaluate functions or the key function for complex grouping.

Foxy

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