<xs:attributeGroup name="StatusRequestMsgHeaderInfo"> <xs:attribute name="CloseoutResponseID" type="mailxml_base:s12" use="optional" /> <xs:attribute name="CreatorSchedulerCorpID" type="mailxml_base:s12" use="required" /> <xs:attribute name="CreatorSchedulerID" type="mailxml_base:s12" use="optional" /> </xs:attributeGroup>