[Jslib] Creating a new RDF file with the rdf libraries

[Eric Hodel]

I'm trying to use the following code to create a new RDF file to cache 
data for a livejournal client.  The Filesystem stuff I stole out of 
mozcalc as jslib does not have a getProfileDir() function in DirUtils (I 
didn't check the actual code yet).

The only thing I get so far is the file "livelizard.rdf" created in my 
profile directory.  However, the seq (urn:livelizard:moods) is always 
null, so none of the data gets copied.  I've looked through the docs, 
but can't seem to figure out how to put the pieces together to make it 
do what I want.

(Looking through mozcalc wasn't any help either, apparently it suffers 
from a similar problem.)

function saveMoods() {
   var file = Filesystem.concatPath(Filesystem.getMozUserHomeDir(),
     "livelizard.rdf");
   var livelizardRDF = new RDFFile(file);

   var seq = livelizardRDF.addRootSeq("urn:livelizard:moods");
   if (seq != null) {
     for (var i = 1; i <= moods.length; i++) {
       var mood = moods[i];
       var mood_id = mood[MOOD_ID];
       var mood_name = mood[MOOD_NAME];
       //alert(i + " id: " + mood_id + ", name: " + mood_name);
       var node = seq.addNode(mood_id);
       seq.setAttribute("urn:livelizard:moods:" + mood_id,
         "Name", mood_name);
     }
   }

   livelizardRDF.flush();
}