<xs:element name="DocumentId" type="DocumentIdType" substitutionGroup="DocumentIdType">
<xs:annotation>
<xs:documentation source="http://www.openapplications.org/oagis">Is the primary DocumentId of the document for the given context. For example, if a buyer is sending a Purchase Order to a Suplier the PurchaseOrder Id will be contained with in the DocumentId. Similarily, in the instance of a semantic name of a SalesOrderDocumentReference the DocumentId will carry the senders identifier for the SalesOrder in the DocumentId and the cross-references would be provided by using the other semantic Docmentids.</xs:documentation>
</xs:annotation>
</xs:element>
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