@prefix rr: <http://www.w3.org/ns/r2rml#> .
@prefix foaf: <http://xmlns.com/foaf/0.1/> .
@prefix ex: <http://example.com/> .
@prefix xsd: <http://www.w3.org/2001/XMLSchema#> .
@prefix rml: <http://semweb.mmlab.be/ns/rml#> .
@prefix ql: <http://semweb.mmlab.be/ns/ql#> .
@prefix activity: <http://example.com/activity/> .
@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .
@base <http://example.com/base/> .

<TriplesMap1>
  a rr:TriplesMap;

  rml:logicalSource [ 
    rml:source "student.xml";
    rml:referenceFormulation ql:XPath;
    rml:iterator "/students/student"
  ];

  rr:subjectMap [
    rr:template "http://example.com/resource/student_{ID}";
    rr:class <http://example.com/ontology/Student>;
    rr:graph <http://example.com/graph/students> ;
  ];
	
  rr:predicateObjectMap [ 
    rr:predicate foaf:name ;
    rr:objectMap [ rml:reference "Name" ];
    rr:graph <http://example.com/graph/students> ;
  ] ;

  rr:predicateObjectMap [ 
    rr:predicate <http://example.com/ontology/practises> ;
    rr:objectMap [ 
      a rr:RefObjectMap ;
      rr:parentTriplesMap <TriplesMap2>;
      rr:joinCondition [
        rr:child "Sport" ;
        rr:parent "ID" ;
      ]
    ];
    rr:graph <http://example.com/graph/practise> ;
  ] .

<TriplesMap2>
  a rr:TriplesMap;
		
  rml:logicalSource [ 
    rml:source "sport.xml";
    rml:referenceFormulation ql:XPath;
    rml:iterator "/sports/sport"
  ];

  rr:subjectMap [
    rr:template "http://example.com/resource/sport_{ID}";
    rr:class <http://example.com/ontology/Sport>;
    rr:graph <http://example.com/graph/sports> ;
  ];
	
  rr:predicateObjectMap [ 
    rr:predicate rdfs:label ; 
    rr:objectMap [ rml:reference "Name" ];
  ].