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The namespace http://www.w3.org/2005/xpath-functions/json is used in the combined XSD in C Schemas: <?xml version="1.0" encoding="UTF-8"?> <xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" elementFormDefault="qualified" targetNamespace="http://www.w3.org/2005/xpath-functions" xmlns:j="http://www.w3.org/2005/xpath-functions/json"> <xs:include schemaLocation="analyze-string.xsd"/> <xs:include schemaLocation="schema-for-json.xsd"/> </xs:schema> I don't think it hurts being there, but I can't see that namespace referenced anywhere, in fact, I think it ought to be "http://www.w3.org/2005/xpath-functions". The referenced schema, schema-for-json.xsd, and the body of the text on the relevant functions, uses the namespace http://www.w3.org/2005/xpath-functions instead. I think it can be dropped. Part of ACTION A-654-11.
Thanks, fixed.