<xsd:schema xmlns:xsd="http://www.w3.org/2000/10/XMLSchema" xmlns:xlink="http://www.w3.org/1999/xlink" targetNamespace="http://www.w3.org/1999/xlink" attributeFormDefault="qualified" > <xsd:attributeGroup name="XLinkAttributes"> <xsd:attribute name="xlink:simple" type="xsd:string"/> <xsd:attribute name="xlink:href" type="xsd:uriReference"/> </xsd:attributeGroup> </xsd:schema>