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