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The namespace document for the fn namespace says This namespace is identified by the namespace prefix fn:, which is a predefined prefix. What it means is that the prefix is predefined in XQuery. It's not predefined in XPath or XSLT.
Note also that the dates of specifications referenced from the namespace documents are incorrect (2014 dates). These dates are coded into the ns-*-.xml documents using XML entities. Note also that both the F+O 3.1 and XSLT 3.0 build scripts generate a namespace document for the fn namespace, and these have diverged. The XSLT 3.0 version takes document dates from the /etc biblio database, which is maintained automatically by the build system. I propose to (a) centralise all generation of namespace documents into the F+O build, and (b) adopt the system used in the XSLT 3.0 build to get the document dates right.
WG decision: ACTION-666-01 - Mike to update the namespace document as described in bug 30055.
The namespace document has been updated.