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="x"/>
8    <variable name="y"/>
9  </head>
10  <results>
11    <result>
12      <binding name="x">
13        <uri>http://example.org/x/x</uri>
14      </binding>
15      <binding name="y">
16        <uri>http://example.org/x/y</uri>
17      </binding>
18    </result>
19    <result>
20      <binding name="x">
21        <uri>http://example.org/x/x</uri>
22      </binding>
23      <binding name="y">
24        <bnode>y</bnode>
25      </binding>
26    </result>
27  </results>
28</sparql>
29