<?xml version="1.0"?>
<sparql xmlns='http://www.w3.org/2005/sparql-results#'>
<head>
<variable name='s'/>
<variable name='p'/>
</head>
<results>
<result>
<binding name='s'><uri>http://www.example.org/b</uri></binding>
<binding name='p'><uri>http://www.example.org/p</uri></binding>
</result>
</results>
</sparql>