XML schema problem for two definitions of the same element.

[Hess Yvan <yvan.hess@imtf.ch>]

I have a XML situation that have many time the same element but with a
different defininiton as illustrated bellow and I would like to create the
XML schema that can validate this document. As you can see only the
<metadata> element differs from the first and second <document> element. The
first <document> element must occur only once and the second <document>
element can appears 0..unbounded. How can solve my problem?

Thanks for your answer.

Regards. Yvan

-------------
XML document:
-------------

<edoc>
   <document>
      <metadata>
         <documenttype>BODY</documenttype>
         <from>yhe</from>
         <to>yvan</to>
      </metadata>
      <content>this is the content of the first document</content>
   </document>
   <document>
      <metadata>
         <documenttype>ATTACHMENT</documenttype>
         <filename>test.doc</filename>
         <filesize>100</filesize>
      </metadata>
      <content>this is the content of the second document</content>
   </document>
</edoc>

-------------
XML schema:
-------------

<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema";
elementFormDefault="qualified">
   <xs:element name="edoc">
      <xs:complexType>
         <xs:sequence>
            <xs:element name="document">
               <xs:complexType>
                  <xs:sequence>
                     <xs:element name="metadata">
                        <xs:complexType>
                           <xs:sequence>
                              <xs:element name="documenttype"
type="xs:string"/>
                              <xs:element name="from" type="xs:string"/>
                              <xs:element name="to" type="xs:string"/>
                           </xs:sequence>
                        </xs:complexType>
                     </xs:element>
                     <xs:element name="content" type="xs:string"/>
                  </xs:sequence>
               </xs:complexType>
            </xs:element>
            <xs:element name="document" minOccurs="0" maxOccurs="unbounded">
               <xs:complexType>
                  <xs:sequence>
                     <xs:element name="metadata">
                        <xs:complexType>
                           <xs:sequence>
                              <xs:element name="documenttype"
type="xs:string"/>
                              <xs:element name="filename" type="xs:string"/>
                              <xs:element name="filesize" type="xs:string"/>
                           </xs:sequence>
                        </xs:complexType>
                     </xs:element>
                     <xs:element name="content" type="xs:string"/>
                  </xs:sequence>
               </xs:complexType>
            </xs:element>
         </xs:sequence>
      </xs:complexType>
   </xs:element>
</xs:schema>


Yvan Hess
Chief Software Architect

e-mail: yvan.hess@imtf.ch
phone : +41 (0)26 460 66 66 
fax   : +41 (0)26 460 66 60 

Informatique-MTF SA
Route du Bleuet 1 
CH-1762 Givisiez 
        
Systemintegrators for eDocuments 
http://www.imtf.com

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