Joining results of two independent RDF resources via URL

Hi,
I'd like to join the results of  two independent RDF  data stores.  The
join is done via the URL, since both sources contain complementary (!)
informations about the same resources.

E.g.:

RDF Store 1, underlaying source: RDF File with RDQL web interface
(Jena Toolkit),  see also http://nutria.cs.tu-berlin.de/NE

<rdf:Description
rdf:about="http://squid.cis.cs.tu-berlin.de/module/dbs/analyse/Output/index.html">

<neweco:granularitytype
rdf:resource="http://nutria.cs.tu-berlin.de/NE/rdfs#module"/>
<lom-edu:intendedEndUserRole
rdf:resource="http://ltsc.ieee.org/2002/09/lom-educational#Learner"/>
</rdf:Description>

RDF Store 2, underlaying source Google Search Engine with web interface
(Jena Toolkit), see also http://nutria.cs.tu-berlin.de/roodolf

<RooDolF:ResultElement
rdf:about="http://squid.cis.cs.tu-berlin.de/module/dbs/analyse/Output/index.html">

<dc:title>Analyse der Anforderungen an Datenbanksysteme</dc:title>
<dc:description>Es werden ....</dc:description>
 </RooDolF:ResultElement>

Joining 1 and 2  via URL

rdf: Description
rdf:about="http://squid.cis.cs.tu-berlin.de/module/dbs/analyse/Output/index.html"

=
RooDolF:ResultElement
rdf:about="http://squid.cis.cs.tu-berlin.de/module/dbs/analyse/Output/index.html"

Expected Result:

<rdf:Description
rdf:about="http://squid.cis.cs.tu-berlin.de/module/dbs/analyse/Output/index.html">

 <neweco:granularitytype
rdf:resource="http://nutria.cs.tu-berlin.de/NE/rdfs#module"/>
<lom-edu:intendedEndUserRole
rdf:resource="http://ltsc.ieee.org/2002/09/lom-educational#Learner"/>
<dc:title>Analyse der Anforderungen an
Datenbanksysteme</dc:title>
 <dc:description>Es werden ....</dc:description>
</rdf:Description>

I'm looking for technologies to define and realize the join easily. I'm
interested in a working solution.  What RDF-based tools, languages,
views  ... should I use for the implementation?

--
___________________________________________________________

  Alexander Löser
  Technische Universitaet Berlin Fakultaet IV - CIS
  bmb+f-Projekt: "New Economy, Neue Medien in der Bildung"
  hp: http://cis.cs.tu-berlin.de/~aloeser/
  office: +49- 30-314-25551
  fax   : +49- 30-314-21601
___________________________________________________________