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