Creating Arrays of structured fields with XMP 3.2 SDK

Question

I'm trying to get the Adobe XMP SDK 3.2 to operate in the same manner as the<br />IMetaDataAccess interface in InDesign / InCopy.<br /><br />1. Consider the following snippet of InDesign SDK code.<br /><br />foo( IMetaDataAccess * myMeta )<br />{<br />PMString regPrefix;<br />PMString ns( "http://my.namespace.com/test/" );<br />PMString nspfx( "myns" );<br /><br />myMeta->RegisterNamespace( ns, nspfx, regPrefix );<br /><br />PMString path( "testpath" );<br /><br />// Create a new bag array<br /><br />myMeta->AppendArrayItem( ns, path, emptyStr, metadata_bag, metadata:kPropValueIsStruct );<br />.....<br />}<br /><br />This will generate the following entry in the XMP.<br /><br /><rdf:Description rdf:about="" xmlns:myns="http://my.namespace.com/test/"><br />         <myns:testpath><br />            <rdf:Bag><br />               <rdf:li rdf:parseType="Resource"><br />               </rdf:li><br />            </rdf:Bag><br />         </myns:testpath ><br />      </rdf:Description><br /><br />2. Consider the following using the XMP SDK<br /><br />foo2( SXMPMeta * myMeta )<br />{<br />std::string registeredPrefix("");<br />PMString emptyStr("");<br /><br />myMeta->RegisterNamespace( "http://my.namespace.com/test/" , "myns", &registeredPrefix );<br /><br />try<br />{<br />myMeta->AppendArrayItem( "http://my.namespace.com/test/", "testpath", kXMP_PropValueIsArray, "" );<br />.....<br />}<br />catch( ... )<br />{<br /><br />}<br />}<br /><br />This will generate the following entry in the XMP.<br /><br /><rdf:Description rdf:about="" xmlns:myns="http://my.namespace.com/test/"><br />         <myns:testpath><br />            <rdf:Bag><br />               <rdf:li/><br />            </rdf:Bag><br />         </myns:testpath ><br />      </rdf:Description><br /><br />i.e the rdf:parseType="Resource" entry is missing from the generated xmp.<br /><br />This then causes problems with adding items to the array with<br /><br />myMeta->SetStructField( "http://my.namespace.com/test/", "testpath[1]", "http://my.namespace.com/test/", "Name1", "Value1" );<br /><br />I just get an exception raised. ( The SetStructField works if the rdf:parseType="Resource" entry is in place ).<br /><br />So my question is how do I get the rdf:parseType="Resource" tag to appear in the rdf:li element using the XMP 3.2 SDK??<br /><br />my aim is to create some xmp like this<br /><br /><rdf:Description rdf:about="" xmlns:myns="http://my.namespace.com/test/"><br />         <myns:testpath><br />            <rdf:Bag><br />               <rdf:li/><br />                  <myns:id>1111</myns:id><br />                  <myns:name>Albert</myns:name><br />               </rdf:li><br />               <rdf:li/><br />                  <myns:id>1112</myns:id><br />                  <myns:name>Fred</myns:name><br />               </rdf:li><br />            </rdf:Bag><br />         </myns:testpath ><br />      </rdf:Description><br /><br />TIA.<br />Mike.

Answer 1

solved it now!
myMeta->AppendArrayItem( "http://my.namespace.com/test/", "testpath", kXMP_PropValueIsArray, "" );
should actually be
myMeta->AppendArrayItem( "http://my.namespace.com/test/", "testpath", kXMP_PropValueIsArray, nil, kXMP_PropValueIsStruct );