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<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE schema PUBLIC "-//W3C//DTD XMLSCHEMA 200102//EN" "http://www.w3.org/2001/XMLSchema.dtd"> <xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"> <xs:element name="extension"> <xs:complexType> <xs:attribute name="point" type="xs:string" use="required"/> </xs:complexType> </xs:element> </xs:schema>