question about match conditions in triple

Hi,

I'm going create application with table of some information. I need add 
some functionality to filter specific data.

For example I have some rdf like this:

   <RDF:Description RDF:about="http://www.dbroom.com/locations/13"
                    ROOMS:Location="Domek"
                    ROOMS:Desc="fdfs">
     <ROOMS:Price NC:parseType="Integer">20</ROOMS:Price>
     <ROOMS:NumRooms NC:parseType="Integer">4</ROOMS:NumRooms>
   </RDF:Description>
   <RDF:Description RDF:about="http://www.dbroom.com/locations/53"
                    ROOMS:Location="Domek"
                    ROOMS:Desc="">
     <ROOMS:Price NC:parseType="Integer">12</ROOMS:Price>
     <ROOMS:NumRooms NC:parseType="Integer">23</ROOMS:NumRooms>
   </RDF:Description>
   <RDF:Description RDF:about="http://www.dbroom.com/locations/2"
                    ROOMS:Location="Bielsko"
                    ROOMS:Desc="Takie se miejsce">
     <ROOMS:Price NC:parseType="Integer">4</ROOMS:Price>
     <ROOMS:NumRooms NC:parseType="Integer">12</ROOMS:NumRooms>
   </RDF:Description>

if user set filter to Location="Do" I want show in table only two rows 
witch match to this filter:

<RDF:Description RDF:about="http://www.dbroom.com/locations/13"
                    ROOMS:Location="Domek"
                    ROOMS:Desc="fdfs">
     <ROOMS:Price NC:parseType="Integer">20</ROOMS:Price>
     <ROOMS:NumRooms NC:parseType="Integer">4</ROOMS:NumRooms>
   </RDF:Description>
   <RDF:Description RDF:about="http://www.dbroom.com/locations/53"
                    ROOMS:Location="Domek"
                    ROOMS:Desc="">
     <ROOMS:Price NC:parseType="Integer">12</ROOMS:Price>
     <ROOMS:NumRooms NC:parseType="Integer">23</ROOMS:NumRooms>
   </RDF:Description>

First my idea is create second rdf file in memory and I filter self this 
original rdf in java-script. This rdf in memory will be set as 
datasource in my list in xul.
But maybe is more easy way to resolve this problem ?
I will wait for other proposition.

Regards Hsd