add URI options to cim-trig.pl?

[VladimirAlexiev]

(More general than #143)

The cim-trig.pl script currently does the bare minimum with URIs and emits them as follows:

• resources: <MAS>#_<uuid>
• models: urn:uuid:<uuid>

But https://github.com/Sveino/Inst4CIM-KG/tree/develop/rdf-improved#cim-uris-and-resolvability describes more considerations. In particular:

• URL policy about MAS and BASE #98 criticizes using URLs for resources and makes the case this will endanger their stability
• consider resolvable model (graph) URLs #147 discusses using URLs for models

Should we add options to the script to control this? For example:

• --resource-url-mas-hash: use <MAS>#_<uuid> for resources (current default)
• --resource-urn: use urn:uuid:<uuid> URNs for resources
• --resource-url-dash: use dash not hash, and remove parasitic underscore
• --resource-url-base: use <base>/<uuid> (explicitly given base instead of MAS) for resources
• --model-urn: use urn:uuid:<uuid> for models (current default)
• --model-url-mas: use <MAS>/<uuid> URLs for model
• --model-url-base: use <base>/<uuid> (explicitly given base instead of MAS) for model

It would enable experimentation with various scenarios, but will hardly promote interoperability. Assigning to Svein to decide, then cancel or reassign to me.