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           datasources="rdf:null" creates a tree capable of
            having RDF data sources attached to it.  Without this attribute, the
            tree will be a static tree.  rdf:null is a
            special null datasource, it acts as a placeholder for the actual
            datasource, which will be attached at runtime.  It is possible to
            specify other "special" rdf data sources (such as rdf:bookmarks)
            or an RDF url instead of rdf:null.  It is also possible
            to list multiple data sources, separated by spaces.
           containment="http://home.netscape.com/NC-irc#chanuser"
            tells the tree which arc name points to data contained by this
            tree.
           The uri="..." attribute specifies that the
            contents of that tag will be constructed for each
            containment arc in the data source.
           Attribute values prefixed by rdf: will be replaced by
            the target of the RDF arc leading from the matching
            containment target.
           The root RDF node for this tree is set at runtime.
           The state attribute is used as a selector in the CSS rules to determine which
          	 image to display.
     
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