/Users/michele.pasin/dev2/ontospy-examples/rdf/schemaorg-30.1.ttl
https://ref.gs1.org/voc/gtin
rdf:Property
@prefix gs1: <https://ref.gs1.org/voc/> . @prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> . gs1:gtin a rdf:Property .