Edit broadcasting

Hi,

I'd like to know if there is any way to make XUL elements having the 
same datasource to update their content upon edition.

I doubt it would be possible with a broadcaster since I'm using a template.

What I would like is to have the textboxes from the example below 
showing the same ?authorfirstname syncing their content.  Do I have to 
manually update the datasource with javascript?


<vbox datasources="bookstore_ext.rdf.php?classname=Book 
bookstore_ext.rdf.php?classname=Author" 
ref="http://localhost/genericStore/Book">
		<label value="test" />
	  <template>
	    <rule>
	      	<conditions>
	      	 <content uri="?uri"/>
	      	 <member container="?uri" child="?book"/>
	          <triple subject="?book"
	                  predicate="http://localhost/genericStore/Book#Author"
	                  object="?author"/>
	          <triple subject="?book"
	                  predicate="http://localhost/genericStore/Book#Title"
	                  object="?title"/>
						<triple subject="?book"
	                  predicate="http://localhost/genericStore/Book#ISBN"
	                  object="?isbn"/>
	      	</conditions>
	      	<bindings>
	     		<binding subject="?book"
	      						 predicate="http://localhost/genericStore/Book#Publisher"
	      						 object="?publisher" />
			<binding subject="?publisher"
	                  predicate="http://localhost/genericStore/Publisher#Name"
	                  object="?publishername"/>
	          <binding subject="?author"
	                  predicate="http://localhost/genericStore/Author#LastName"
	                  object="?authorlastname"/>
	          <binding subject="?author"
	 
predicate="http://localhost/genericStore/Author#FirstName"
	                  object="?authorfirstname"/>
	      	</bindings>
	      	<action>
	      	
	        <label uri="?book" value="?title" />
	        <textbox uri="?book" value="?authorfirstname" />
	
	        </action>
	    </rule>
	  </template>		
</vbox>	


Thank you for your help!
Denis Laprise