<?xml version="1.0"?>
<sparql
    xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
    xmlns:xs="http://www.w3.org/2001/XMLSchema#"
    xmlns="http://www.w3.org/2005/sparql-results#" >
  <head>
    <variable name="x"/>
    <variable name="v"/>
    <variable name="y"/>
    <variable name="w"/>
    <variable name="g"/>
  </head>
  <results ordered="false" distinct="false">
  </results>
</sparql>
