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Guidance on implementing extension functions #140

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@theneosloth

I'm working on a CLI that uses Xee and I'd like to implement the functions from https://expath.org/spec/binary as well as backport a few from XQuery 4.0.

I was able to start the implementation by following https://github.com/Paligo/xee/blob/main/hacking.md but because these functions are under a non standard namespace I also had to add additional namespaces under xee_name for the xpath_fn macro to compile

Is this the right path down implementing extension functions? Can xpath_fn be used outside the library crate?

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