<?xml version="1.0" encoding="utf-8"?> 

<rdf:RDF 
  xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" 
  xmlns="http://purl.org/puninj/2001/05/rgml-schema#"
  xmlns:rgml="http://purl.org/puninj/2001/05/rgml-schema#">

<Graph rdf:ID="g1" rgml:directed="true">
   <graphs>
      <rdf:Bag>
         <rdf:li rdf:resource="#g2"/>
         <rdf:li rdf:resource="#g3"/>
      </rdf:Bag>
   </graphs>
</Graph>

<Graph rdf:ID="g2" rgml:directed="true">
   <nodes>
      <rdf:Bag>
         <rdf:li rdf:resource="#n1"/>
         <rdf:li rdf:resource="#n2"/>
      </rdf:Bag>
   </nodes>

   <edges>
      <rdf:Bag>
         <rdf:li rdf:resource="#e1"/>
      </rdf:Bag>
   </edges>
</Graph>

<Graph rdf:ID="g3" rgml:directed="true">
   <nodes>
      <rdf:Bag>
         <rdf:li rdf:resource="#n3"/>
         <rdf:li rdf:resource="#n4"/>
      </rdf:Bag>
   </nodes>

   <edges>
      <rdf:Bag>
         <rdf:li rdf:resource="#e2"/>
      </rdf:Bag>
   </edges>
</Graph>

<Node rdf:ID="n1"/>
<Node rdf:ID="n2"/> 
<Node rdf:ID="n3"/>
<Node rdf:ID="n4"/>

<Edge rdf:ID="e1">
    <source rdf:resource="#n1"/>
    <target rdf:resource="#n2"/>
</Edge>
<Edge rdf:ID="e2">
    <source rdf:resource="#n3"/>
    <target rdf:resource="#n4"/>
</Edge>

</rdf:RDF>

