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3.1.5 Static Function Calls "[Definition: The built-in functions supported by XPath 3.1 are defined in [XQuery and XPath Functions and Operators 3.1].]" *built-in functions* is bolded in the text, but appears only once in XQeury and XPath Functions etc. and then in a note. Shouldn't "built-in functions" be designated in some manner? Perhaps "functions defined in [XQuery and XPath Functions and Operators 3.1] are supported by XPath 3.1." In which case a general reference would be correct.
Conformance is actually the place that we say which functions are built in: <quote> An implementation of all functions defined in [XQuery and XPath Functions and Operators 3.1], and a definition of every item specified to be implementation-defined, unless that function or item is part of an optional feature that is not provided by the implementation. </quote> The term built-in functions is actually used about 7 times, judging by grep. Better to define it than eliminate it.
This is closely related to https://www.w3.org/Bugs/Public/show_bug.cgi?id=28282, where a fix has been proposed. *** This bug has been marked as a duplicate of bug 28282 ***