<xsd:element name="StaffingAdditionalData"> <xsd:complexType> <xsd:choice> <xsd:sequence> <xsd:element ref="CustomerReportingRequirements" /> <xsd:group ref="ReferenceInformation" minOccurs="0" /> </xsd:sequence> <xsd:group ref="ReferenceInformation" /> </xsd:choice> </xsd:complexType> </xsd:element>