<xs:complexType name="CT_UpdateSheets" xmlns:xs="http://www.w3.org/2001/XMLSchema"> <xs:choice minOccurs="0" maxOccurs="unbounded"> <xs:element name="deleteSheet" type="CT_Delete" /> <xs:element name="insertSheet" type="CT_Sheet" /> <xs:element name="updateSheet" type="CT_UpdateSheet" /> </xs:choice> </xs:complexType>