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The definition of expanded-QName in the F+O spec needs to be brought into line with the definition in other specs: XDM, XPath/XQuery, and XSLT all define it as a triple, but F+O still describes it as a URI/local-name pair.
Agreed editorial fix
I have changed the definition to be the one used in the XSLT specification: An <term>expanded-QName</term> is a value in the value space of the <code>xs:QName</code> datatype as defined in the XDM data model (see <bibref ref="xpath-datamodel-31"/>): that is, a triple containing namespace prefix (optional), namespace URI (optional), and local name. Two expanded QNames are equal if the namespace URIs are the same (or both absent) and the local names are the same. The prefix plays no part in the comparison, but is used only if the expanded QName needs to be converted back to a string.