Annex A: APS DIDL document

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   xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
   <!-- Item representing the APS asset -->
   <didl:Item id="uuid-27975c8a-965c-11d9-81d6-ab2d295f8855">
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       <didl:Descriptor>
           <didl:Statement mimeType="application/xml; charset=UTF-8">
               <dii:Identifier xmlns:dii="urn:mpeg:mpeg21:2002:01-DII-NS">
                   doi:10.1103/PhysRevB.69.174413</dii:Identifier>
           </didl:Statement>
       </didl:Descriptor>
       <!-- ++++++++++++++++++++++++++++++++++++++++++++++++ -->
       <!-- Constituent datastream of the APS asset -->
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           <!-- creation datetime of the datastream -->
           <didl:Descriptor>
               <didl:Statement mimeType="application/xml; charset=UTF-8">
                   <dcterms:created xmlns:dcterms="http://purl.org/dc/terms/">
                       2004-05-18T15:43:33Z</dcterms:created>
               </didl:Statement>
           </didl:Descriptor>
           <!-- XML Signature computed over the datastream -->
           <didl:Descriptor>
               <didl:Statement mimeType="application/xml; charset=UTF-8">
                   <dsig:Signature xmlns:dsig="http://www.w3.org/2000/09/xmldsig#">
                       ...
                   </dsig:Signature>
               </didl:Statement>
           </didl:Descriptor>
           <!-- By-Value provision of the datastream -->
           <didl:Resource mimeType="application/xml; charset=UTF-8" ref="http://oai.aps.org/ 
               filefetch?identifier=PhysRevB.69.174413&description=apsmeta"/>
       </didl:Component>
       <!-- ++++++++++++++++++++++++++++++++++++++++++++++++ -->
       <!-- Constituent datastream of the APS asset -->
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        <didl:Component id="uuid-279ee2d4-965c-11d9-81d6-ab2d295f8855">
           <!-- creation datetime of the datastream -->
           <didl:Descriptor>
               <didl:Statement mimeType="application/xml; charset=UTF-8">
                   <dcterms:created xmlns:dcterms="http://purl.org/dc/terms/">
                       2004-05-18T15:43:33Z</dcterms:created>
               </didl:Statement>
           </didl:Descriptor>
           <!-- XML Signature computed over the datastream -->
           <didl:Descriptor>
               <didl:Statement mimeType="application/xml; charset=UTF-8">
                   <dsig:Signature xmlns:dsig="http://www.w3.org/2000/09/xmldsig#">
                       ...
                   </dsig:Signature>
               </didl:Statement>
           </didl:Descriptor>
           <!-- By-Value provision of the datastream -->
           <didl:Resource mimeType="application/pdf" ref="http://oai.aps.org/
               filefetch?identifier=PhysRevB.69.174413&description=print"/>
       </didl:Component>
   </didl:Item>
</didl:DIDL>