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The specification of json-to-xml() says that it returns elements in the namespace http://www.w3.org/2005/xpath-functions/json but says nothing about the namespace prefix to be used on these elements. By analogy with fn:analyze-string, the prefix should be implementation-dependent. I think this is the implication of the current spec if we say nothing, but it's better to be explicit.
This was accepted by the WG on 10 Mar 2015, and has been applied to the spec.