<xsd:complexType name="CT_VolTopicRef"> <xsd:attribute name="r" type="ST_CellRef" use="required"> <xsd:annotation> <xsd:documentation>Reference</xsd:documentation> </xsd:annotation> </xsd:attribute> <xsd:attribute name="s" type="xsd:unsignedInt" use="required"> <xsd:annotation> <xsd:documentation>Sheet Id</xsd:documentation> </xsd:annotation> </xsd:attribute> </xsd:complexType>