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I noticed when reviewing https://www.w3.org/XML/Group/qtspecs/specifications/xpath-functions-31/src/function-catalog.xml that about half of the functions in the fn namespace (79) have a @prefix="fn" attribute, whereas the other half (76) have no such prefix. For example: <fos:function name="node-name"> But: <fos:function name="nilled" prefix="fn"> I would propose unifying the markup and giving all functions a @prefix attribute.
I have made the suggested change.