[xquery-talk] XQuery user defined function

[Michael Kay]

If my understanding is correct, these days the datatypes of input/ output
parameters of a user defined XQuery function are only allowed to be the
generic datatypes as defined in XQuery Data Model - so that today one can't
use such datatypes as "charstring", "statement", ListOfStatement" etc.  

 
No, you can use any user-defined type that's defined in an imported schema,
provided your XQuery processor is schema-aware.
 
The rules about how types are defined and imported have been greatly
clarified over the last couple of years.
 
Michael Kay
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