<?xml version="1.0"?>
<sparql 
    xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
    xmlns:xs="http://www.w3.org/2001/XMLSchema#" 
    xmlns="http://www.w3.org/2005/sparql-results#">
    <head>
        <variable name="a"/>
        <variable name="y"/>
        <variable name="d"/>
        <variable name="z"/>
    </head>
    <results>
        <result>
            <binding name="a">
                <uri>http://example/x1</uri>
            </binding>
            <binding name="y">
                <uri>http://www.w3.org/1999/02/22-rdf-syntax-ns#Property</uri>
            </binding>
            <binding name="d">
                <literal datatype="http://www.w3.org/2001/XMLSchema#integer">4</literal>
            </binding>
        </result>
        <result>
            <binding name="a">
                <uri>http://example/x1</uri>
            </binding>
            <binding name="z">
                <uri>http://example/z</uri>
            </binding>
            <binding name="d">
                <literal datatype="http://www.w3.org/2001/XMLSchema#integer">4</literal>
            </binding>
        </result>
    </results>
</sparql>
