$out= fopen("../TEMP/temp.dot","w");   
   $dot = file("http://localhost:8080/exist/servlet//db/chriswallace/medical/graph.xql");
   $dotFile = implode($dot," ");
   fwrite($out,$dotFile);    
   fclose($out);

//set output to be GIF
   header("Content-type: image/svg+xml");
//execute the dot program and pass thru the output back to the client
   passthru("/ATT/GraphViz/bin/dot -Tsvg < ../TEMP/temp.dot");