@prefix rdf:    <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
@prefix foaf:       <http://xmlns.com/foaf/0.1/> .
@prefix ex:        <http://example.org/things#> .
@prefix xsd:        <http://www.w3.org/2001/XMLSchema#> .

_:a foaf:name "Eve" ;
    ex:empId "9"^^xsd:integer .

_:f foaf:name "John" ;
    ex:empId [ ex:number "29"^^xsd:integer ] .

_:g foaf:name "Dirk" ;
    ex:empId <http://example.org/dirk01> .