<xsd:complexType name="CT_Connection"> <xsd:attribute name="id" type="ST_DrawingElementId" use="required"> <xsd:annotation> <xsd:documentation>Identifier</xsd:documentation> </xsd:annotation> </xsd:attribute> <xsd:attribute name="idx" type="xsd:unsignedInt" use="required"> <xsd:annotation> <xsd:documentation>Index</xsd:documentation> </xsd:annotation> </xsd:attribute> </xsd:complexType>