<?xml version="1.0"?>
<sparql xmlns="http://www.w3.org/2005/sparql-results#">
  <head>
    <variable name="a"/>
    <variable name="b"/>
    <variable name="c"/>
  </head>
  <results>
    <result>
      <binding name="a">
        <uri>http://example/a2</uri>
      </binding>
      <binding name="b">
        <uri>http://example/b2</uri>
      </binding>
    </result>
    <result>
      <binding name="a">
        <uri>http://example/a4</uri>
      </binding>
    </result>
  </results>
</sparql>
