<xs:attributeGroup name="declarativeGroup" xmlns:xs="http://www.w3.org/2001/XMLSchema"> <xs:attribute name="id" type="ST_UniqueID" use="required" /> <xs:attribute name="caption" type="ST_String" use="required" /> <xs:attribute name="extendedCaption" type="xs:string" use="optional" /> </xs:attributeGroup>