<?xml version="1.0" encoding="utf-16"?> <xs:element name="SourceDocumentFormat"> <xs:complexType> <xs:choice minOccurs="0"> <xs:element ref="DocumentFormatDetails" /> <xs:sequence> <xs:element ref="DocumentFormat" /> <xs:element ref="DocumentFormatVersion" minOccurs="0" /> </xs:sequence> </xs:choice> </xs:complexType> </xs:element>