Improve FAIRness scores

[DiegoVinasco]

Looks like we're failing miserably at FAIRness standards (at least outside of interoperability)

The proposed CityGML 3.0 core ontology scored 23% on the FOOPS validator. Below is a breakdown of the results:

Ontology	Findable	Accessible	Interoperable	Reusable
CGML3 core	0/9	1.5/3	3/3	1/9

Some of these issues are due to the limitations of hosting on Github. For example, we can't host a URL that can resolve into an HTML document based on an HTTP request.

Many issues have to do with metadata that could be easy to add.

For some reason, the validator is not picking up the fact we are generating SKOS documentation for all of our declared classes and properties, which would raise our reusability.

Some things we can do to improve the score are:

• register ontology uris with w3id, purl, DOI or W3C
• make ontology uris the same as their github raw content url
  • although this is technically a minor pitfall in OOPS, this is likely impossible to avoid when using Github
  • we could try storing our ontology files without a file type?
• properly add version uris
• add triple metadata! at minimum:
  • title
  • description
  • license (make sure the license declaration actually resolves for bonus points)
  • version iri
  • creator
  • author *
  • creationDate *
  • namespace URI
• declare a prefix in each ontology
• register metadata with LOV:
  • ontology prefix
  • ontology URL/URI
  • minimum metadata (same as above)
• add other metadata such as:
  • doi
  • previous version *
  • contributor *
  • publisher *
  • logo
  • backwards compatibility
  • status
  • modified
  • source
  • issued date *

* provenance metadata: this is worth bonus point in FAIR assessments

Originally posted by @DiegoVinasco in #19 (comment)