in-memory-datasource problem

[Raymond]

Hi, all.  I have problem to get my in-memory datasource working.  I would
like to use the in-memory datasource to create a menu contains folders and
each folder contains some folders, just like the bookmarks menu.  I am
trying to use "ID" and "about" to achieve what I want to do e.g.  ID="1"
points to about="#1" (please see below), however, I am only able to show a
folder/ folders on the top level and nothing inside those folders.  Can
anyone give me some advice please?  Thanks


Raymond

<!-- the RDF structure I want to achieve in the memory datasource -->
<?xml version="1.0"?>
<rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#";
         xmlns:fly="http:/www.abc.com/fly-rdf#">
 <rdf:Description about="urn:root">
    <fly:rows>
      <rdf:Seq>
        <rdf:li>
          <rdf:Description ID="1" fly:folder="Demo"/>
        </rdf:li>
      </rdf:Seq>
    </fly:rows>
  </rdf:Description>

  <rdf:Description about="#1">
    <fly:rows>
      <rdf:Seq>
        <rdf:li>
          <rdf:Description ID="1_1" fly:folder="Folder 1.1" />
        </rdf:li>
      </rdf:Seq>
    </fly:rows>
  </rdf:Description>

<!-- End: the RDF structure I want get -->

<?xml version="1.0"?>
<window
xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul";>
<menubar>
 <menu  label="Menu">
     <menupopup datasources="rdf:null" ref="urn:root" onpopupshowing="call
the executeRDFQuery()">
 <template>
    <!-- RULE 1: Menu contains folder -->
    <rule>
      <conditions>
        <content uri="?uri"/>
        <triple subject="?uri"
                predicate="http:/www.abc.com/fly-rdf#rows"
                object="?rows"/>
        <member container="?rows" child="?row"/>
        <triple subject="?row"
                predicate="http:/www.abc.com/fly-rdf#folder"
                object="?folder"/>
      </conditions>
      <action>
        <menu label="?folder" uri="?row">
          <menupopup uri="?row"/>
        </menu>
      </action>
    </rule>
 </template>
</menupopup>
</menu>
</menubar>
</window>


/******** js file *************/
var RDFC = '@mozilla.org/rdf/container;1';
RDFC = Components.classes[RDFC].createInstance();
RDFC = RDFC.QueryInterface(Components.interfaces.nsIRDFContainer);

var RDFCUtils = '@mozilla.org/rdf/container-utils;1';
RDFCUtils = Components.classes[RDFCUtils].getService();
RDFCUtils =
RDFCUtils.QueryInterface(Components.interfaces.nsIRDFContainerUtils);

var RDF = '@mozilla.org/rdf/rdf-service;1';
RDF = Components.classes[RDF].getService();
RDF = RDF.QueryInterface(Components.interfaces.nsIRDFService);

Test.prototype.getLevelZero = function()
{
     var dsource =
Components.classes['@mozilla.org/rdf/datasource;1?name=in-memory-datasource'
].createInstance   (Components.interfaces.nsIRDFDataSource);

     var rootSubject = RDF.GetResource('urn:root');
     var rowsPredicate = this.getRDFResource('rows');
     var rowsResource = RDF.GetAnonymousResource();
     var rowsList = RDFCUtils.MakeSeq(dsource, rowsResource);
     dsource.Assert(rootSubject, rowsPredicate, rowsResource, true);

      var row = RDF.GetAnonymousResource();

        /******* add the ID in here ***********/
        dsource.Assert(row, RDF.GetResource('ID'), RDF.GetLiteral("1"),
true);
        /**************************************/

        var predicate = "http:/www.abc.com/fly-rdf#folder";
        var value = "Demo";
        dsource.Assert(row, predicate, RDF.GetLiteral(value), true);

        rowsList.AppendElement(row);

 return dsource;
}

Test.prototype.getLevelOne = function(dsource)
{
     var subject = RDF.GetResource("#1");
     var rowsPredicate = this.getRDFResource('rows');
     var rowsResource = RDF.GetAnonymousResource();
     var rowsList = RDFCUtils.MakeSeq(dsource, rowsResource);
     dsource.Assert(subject, rowsPredicate, rowsResource, true);

      var row = RDF.GetAnonymousResource();

       /******* add the ID in here ***********/
      dsource.Assert(row, RDF.GetResource('ID'), RDF.GetLiteral("1_1"),
true);
      /**************************************/

       var predicate = "http:/www.abc.com/fly-rdf#folder";
        var value = "Folder 1.1";
        dsource.Assert(row, predicate, RDF.GetLiteral(value), true);

        rowsList.AppendElement(row);

 return dsource;
}

Test.prototype.executeRDFQuery = function()
{
    var dsource = this.getLevelZero();
    dsource = this.getLevelOne(dsource);

return dsource;
}
/********End: js file *************/



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