Question: prefix xs is not bound to a namespace?
Answer: 1 Answer. The prefix xs for element xs:schema is not bound. In any XML document that uses namespaces, including an XSD, all used namespace prefixes (e.g. xs ) must be bound to a namespace URI (e.g. http://www.w3.org/2001/XMLSchema ) in order for the XML document to be namespace-well-formed.