RDF resource and tree

Hi,

I'd like to match the following RDF graph

<?xml version="1.0" encoding="iso-8859-1"?>
<RDF:RDF xmlns:RDF="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
          xmlns:AUTHOR="http://localhost/bookstore/rdf/author#"
          xmlns:PUBLISHER="http://localhost/bookstore/rdf/publisher#"
          xmlns:BOOK="http://localhost/bookstore/rdf/book#"
          xmlns:REVIEW="http://localhost/bookstore/rdf/review#">


		<RDF:Description about="http://localhost/bookstore/author/12178">
			<AUTHOR:id>12178</AUTHOR:id>
			<AUTHOR:firstname>Auteur #0</AUTHOR:firstname>
			<AUTHOR:lastname>Nom famille</AUTHOR:lastname>
		</RDF:Description>
[...]
		</RDF:Description>
			<RDF:Description about="http://localhost/bookstore/publisher/12178">
			<PUBLISHER:id>12178</PUBLISHER:id>
			<PUBLISHER:name>Publisher #0</PUBLISHER:name>
		</RDF:Description>
[...]

<RDF:Bag about="http://localhost/bookstore/myBookstore">				<RDF:li>
	 	<RDF:Description about="http://localhost/bookstore/book/12178">
			<BOOK:isbn>714877320</BOOK:isbn>
			<BOOK:title>Livre #0</BOOK:title>
			<BOOK:author resource="http://localhost/bookstore/author/12178" />
			<BOOK:publisher resource="http://localhost/bookstore/publisher/12178" />
		</RDF:Description>
	</RDF:li>

[...]

</RDF:Bag>
</RDF:RDF>

to a tree like this:


	 <tree id="treeBook" key="isbn" enableColumnDrag="true" flex="1" 
sdatasources="bookstore_ext.rdf.php" 
ref="http://localhost/bookstore/myBookstore" onAccept="handleAccept">
	    <treecols>
	      <treecol id="isbn" label="ISBN" flex="1" primary="true" />
	      <treecol id="title" label="Title" flex="2" />
	      <treecol id="author" label="Author" flex="1"  />
	      <treecol id="publisher" label="Publisher" flex="1" />
	    </treecols>
			<template>
				<rule>
				<treechildren flex="1">
					<treeitem uri="rdf:*">
					<treerow  id="rdf:http://localhost/bookstore/book#isbn">
						<treecell label="rdf:http://localhost/bookstore/rdf/book#isbn"/>
						<treecell label="rdf:http://localhost/bookstore/rdf/book#title"/>
						<treecell 
label="rdf:http://localhost/bookstore/rdf/author#lastname" readonly="true"/>
						<treecell 
label="rdf:http://localhost/bookstore/rdf/publisher#name" readonly="true"/>
					</treerow>
					</treeitem>
				</treechildren>
				</rule>
			</template>	   	
	 </tree>

The tree ends up showing the isbn and title of the book, but I did'nt 
succed yet to show the author nor the publisher. I guess a must define a 
predicate but I can't figure it out.

Thank you