1<?xml version="1.0"?>
2<sparql
3    xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
4    xmlns:xs="http://www.w3.org/2001/XMLSchema#"
5    xmlns="http://www.w3.org/2005/sparql-results#" >
6  <head>
7    <variable name="L"/>
8  </head>
9  <results/>
10</sparql>
11