<?xml version="1.0"?>

<!DOCTYPE rdf:RDF [
    <!ENTITY eg   'http://www.hpl.hp.com/semweb/2003/eg#'>
    <!ENTITY rdf  'http://www.w3.org/1999/02/22-rdf-syntax-ns#'>
]>

<rdf:RDF xmlns:rdf="&rdf;" xmlns="&eg;">

  <rdf:Description rdf:about="&eg;a">
    <p rdf:resource="&eg;b"/>
    <fubar>Hello world</fubar>
  </rdf:Description>

  <rdf:Description rdf:about="&eg;c">
    <p rdf:resource="&eg;d"/>
  </rdf:Description>

</rdf:RDF>