gtfs:transfer_duration leaf node

@prefix gtfs: <http://ontology.gtfs.org/reference#> .
@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .
@prefix xsd: <http://www.w3.org/2001/XMLSchema#> .

gtfs:transfer_duration a rdf:Property ;
    rdfs:label "transfer_duration"@en,
        "duracion_transferencia"@es,
        "duracao_transferencia"@pt ;
    rdfs:comment "Length of time in seconds before a transfer expires."@en,
        "Duración en segundos antes de que expire una transferencia."@es,
        "Duração em segundos antes que uma transferência expire."@pt ;
    rdfs:domain gtfs:FareAttribute ;
    rdfs:range xsd:integer .