<?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="s"/>
    <variable name="o"/>
  </head>
  <results>
    <result>
        <binding name="s"><uri>http://example/x1</uri></binding>
        <binding name="o"><literal>abc</literal></binding>
    </result>
    <result>
        <binding name="s"><uri>http://example/x2</uri></binding>
        <binding name="o"><literal>abc</literal></binding>
    </result>
  </results>
</sparql>