> The module files should contain syntactically valid XQuery code. The formal
> semantics spec you cite is not concerned with syntax, and not everything
> described there has a coresponding syntactic construct. The none type is one
> example from the formal semantics that cannot be expressed syntactically. To
> see what types can be expressed syntactically, you have to look here:
I see this makes sense.
One more thing though: where is the exception added for the fn:error function:
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