add tsv2owl.pl and options -vocab and -ontology

[VladimirAlexiev]

tsv2soml.pl generates SOML from a sheet. In internal projects we've been using a script owl-gen.pl that generates OWL from the same sheet. Commit it here as tsv2owl.pl.

For example, for the Ontotext KG (OTKG), we use schema.org (s:) as vocabulary namespace but otkg: as the ontology URL. Typically you'd use an ontology preamble, eg like this otkg-preamble.ttl:

@prefix otkg: <https://kg.ontotext.com/resource/ontology/>.
@prefix s:    <http://schema.org/> .

<https://kg.ontotext.com/resource/ontology> a owl:Ontology ;
  rdfs:label      "OTKG Ontology" ;
  dct:created     "2023-01-25"^^xsd:date ;
  dct:creator     <http://ontotext.com> ;
  owl:versionInfo "1.0" .

Add two options:

• -vocab: default namespace for classes and props that don't have a specific URL in the RDF column. Eg
  • keywords will be emitted as s:keywords because it doesn't have an RDF value
  • but buyersJourney will be emitted as otkg:buyersJourney because that is its RDF value
• -ontology:
  • The value should match the owl:Ontology URL that you use in the preamble
  • It can be a prefixed URL (eg otkg:, in this case the URL ends in a slash) or a full URL (eg <https://kg.ontotext.com/resource/ontology>)
  • For each term (class and prop), adds rdfs:isDefinedBy pointing to the ontology. This is a common practice and is used eg by MetaPhactory when collecting properties to generate forms.
  • Adds the current date as dct:modified of the ontology

You can run the tool with a Makefile like this:

otkg.ttl ::
    curl -Ls "https://docs.google.com/spreadsheets/d/.../export?format=tsv" |  perl -S tsv2owl.pl  | cat otkg-preamble.ttl - > OTKG-unformatted.ttl
    riot --formatted=ttl OTKG-unformatted.ttl | perl -00e '@a=<>; print sort @a' > otkg.ttl
    rm OTKG-unformatted.ttl

This generates term definitions from the sheet, prepends the preamble, formats the result with Jena riot, and finally sorts it by term (Turtle block: such "paragraphs" are separated by a double newline)