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https://www.w3.org/TR/xpath-functions-31/#func-exists in the "Examples" section has the following lines: --------------------------------------------- Assuming $in is an element with no children: let $break := return fn:exists($break) The result is true(). ------------------------------------------- The right hand side in the "let $break :=" appears to be missing.
The example was intended to read let $break := <br/> return fn:exists($break) (though where $in fits into that is anyone's guess)
The working group agrees. ACTION A-669-01: MK to prepare an erratum for Bug 30133, prepare new errata document. ETA 29 August.
Resolved in errata document. https://www.w3.org/XML/2017/qt-errata/xpath-functions-31-errata.html#E1