@prefix rr: <http://www.w3.org/ns/r2rml#> .
@prefix foaf: <http://xmlns.com/foaf/0.1/> .
@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .
@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#> .

@base <http://example.com/base/> .

<TriplesMap1>
  a rr:TriplesMap;

  rml:logicalSource [
    rml:source "persons.xml";
    rml:referenceFormulation ql:XPath;
    rml:iterator "/persons/person"
  ];

  rr:subjectMap [ rml:reference "FirstName" ];

  rr:predicateObjectMap [
    rr:predicate foaf:name;
    rr:objectMap [
      rml:reference "FirstName"
    ]
  ] .