/Users/michele.pasin/dev2/ontospy-examples/rdf/schemaorg-30.1.ttl
http://unece.org/vocab#SerialId
rdf:Property
@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> . @prefix unece: <http://unece.org/vocab#> . unece:SerialId a rdf:Property .