Need help implimenting PLUS ldf in c++ via XMP sdk

I'm apparently suffering major brainstem bitrot and generating lots of brain coredumps, and I need help.
I'm using the XMP toolkit sdk 5.1.2 in c++ under gcc on Debian to impliment embedding PLUS ldf licensing metadata (reference: http://ns.useplus.org/LDF/ldf-XMPReference ) into images.
I have no problems generating compliant plus ldf xmp in code for everything EXCEPT for single line detail entries like "<rdf:type rdf:resource="plus:LicenseeDetail"/>" in several places in the ldf specification, viz:
<plus:Licensee>
   <rdf:Seq>
     <rdf:li>
          <rdf:type rdf:resource="plus:LicenseeDetail"/>
          <plus:LicenseeID>http://plus-id.org/AAA-987</plus:LicenseeID>
          <plus:LicenseeName>ABC Advertising Agency</plus:LicenseeName>
     </rdf:li>
   </rdf:Seq>
</plus:Licensee>
I can generate the appropriate text in memory then parse that to get an appropriate SXMPMeta and merge that, but I would really like to be able to properly generate the proper xmp in code, and would really appreciate any help preventing further brainrot!
I'm certain it's both simple and trivial, but I now can't see the trees because of the forest ... Thanks

Hi,
I'm not a XMP expert but I've been working for some years with Semantic Web technologies. My understanding is that XMP is a subset of RDF (one of the main pieces of the Semantic Web) so I will try to make my contribution to this problem from there.
Consequently, looking at your problematic piece of XMP:
<plus:Licensee>
   <rdf:Seq>
     <rdf:li>
          <rdf:type rdf:resource="plus:LicenseeDetail"/>
          <plus:LicenseeID>http://plus-id.org/AAA-987</plus:LicenseeID>
          <plus:LicenseeName>ABC Advertising Agency</plus:LicenseeName>
     </rdf:li>
   </rdf:Seq>
</plus:Licensee>
I can say that it isn't valid RDF so it shouldn't be proper XMP. This can be confirmed looking at the example for the property plus:Licensee available from the specification (http://ns.useplus.org/LDF/ldf-XMPSpecification#Licensee):
<plus:Licensee>
   <rdf:Seq>
      <rdf:li rdf:parseType="Resource">
         <rdf:type rdf:resource="plus:LicenseeDetail"/>
         <plus:LicenseeID>http://plus-id.org/AAA-987</plus:LicenseeID>
         <plus:LicenseeName>ABC Advertising Agency</plus:LicenseeName>
      </rdf:li>
   </rdf:Seq>
</plus:Licensee>
I have marked in bold where the problem is. Your piece of XML is missing the rdf:parseType="Resource" construct. I will explain why this is necessary from what I know from RDF. RDF is based on a graph model. There are resources, which correspond to graph nodes and represent the things the RDF metadata is talking about, and properties, which correspond to graph edges and represent the attributes and relations used to say things about the resources.
In RDF the convention is to use lowercase names for properties. This doesn't seem to be the convention in XMP so we must take a closer look at the XMP piece in order to identify what parts correspond to resources and to properties. From the LDF specification we know that plus:Licensee correspond to a property so it should link to a resource, in this case rdf:Seq (more specifically it is an anonymous resource (no id provided) of type rdf:Seq). Your example should have some additional markup before plus:Licensee, surely the resource that represents the licensee about which we are specifying the licensee using the plus:Licensee property.
Now, if we continue from the resource of type rdf:Seq, there is the rdf:li property (lower case as it is directly reused from the RDF specification). The problem now is that if we look directly inside rdf:li property we find rdf:type, plus:LicenseeID and plus:LicenseeName. It is clear that rdf:type (lowercase) is a property and from the LDF specification we can see that the other two also correspond to properties. Therefore, there is the problem. We have a property (rdf:li) pointing to three properties (rdf:type,...) so we are breaking the graph data model: nodes (resources) are connected through edges (properties) that link two nodes.
This is not the case for the example in the LDF specification. The rdf:parseType="Resource" constructs is a shortcut for:
<rdf:li>
   <rdf:Resource>
         <rdf:type rdf:resource="plus:LicenseeDetail"/>
         <plus:LicenseeID>http://plus-id.org/AAA-987</plus:LicenseeID>
         <plus:LicenseeName>ABC Advertising Agency</plus:LicenseeName>
   </rdf:Resource>
</rdf:li>
It basically says that the following properties should be parsed as being connected to an anonymous resource. In order to make it clearer, it is helpful to look at the graph behing that markup. For instance, you can use the RDF2SVG service and render the graph behind the example from the specification (which I have make available from a custom URL):
http://rhizomik.net/redefer-services/render?rdf=http://rhizomik.net:8080/html/~roberto/tmp /ldf-simple-example.rdf&format=RDF/XML&mode=svg&rules=http://rhizomik.net:8080/html/redefe r/rdf2svg/showgraph.jrule
I hope all this makes it clearer.
Best,
Roberto García
http://rhizomik.net/~roberto/

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Need help implimenting PLUS ldf in c++ via XMP sdk

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