I'm guessing from your choice of element names that your hierarchic
structure is positional rather than defined by pointers.

This makes it a positional grouping problem. Such problems are always much
easier in XSLT 2.0, so you need to make it clear whether you want a 1.0 or a
2.0 solution.

Michael Kay
http://www.saxonica.com/

> -----Original Message-----
> From: SEXpeare [mailto:sexpeare@xxxxxxxxx] 
> Sent: 08 March 2007 10:20
> To: xsl-list@xxxxxxxxxxxxxxxxxxxxxx
> Subject:  Transforming a non-hierarchical XML into a 
> hierarchical one
> 
> Hello everybody, I have to transform a non hierarchical XML:
> 
> 	<sumario>
> 		<seccion txt=""/>
> 		<subseccion txt=""/>
> 		<organismo txt=""/>
> 		<anuncio txt=""/>
> 		<organismo txt=""/>
> 		<anuncio txt=""/>
> 		<organismo txt=""/>
> 		<anuncio txt=""/>
> 		<subseccion txt=""/>
> 		<organismo txt=""/>
> 		<anuncio txt=""/>
> 		<seccion txt=""/>
> 		<subseccion txt=""/>
> 		<organismo txt=""/>
> 		<anuncio txt=""/>
> 		...
> 	</sumario>
> 
> into a hierarchical XML, doing this via XSLT. The result must 
> be like this:
> 
> 	<sumario>
> 		<seccion id="">
> 			<subseccion id="">
> 				<organismo id="">
> 					<anuncio>
> 					</anuncio>
> 					...			
> 			
> 				</organismo>
> 			</subseccion>
> 		</seccion>
> 		...
> 	</sumario>
> 
> I would apreciate any idea or advice, thx.