Ontology: restructure unit and related properties

[stap-m]

Description of the issue

• unit is an independent continuant. Discuss, if we should classify it as generically dependent continuant.
• we have the relation _is unit of_ (RO) but no relation _has unit_
• we are currently unsing _has part_ instead. Is that clean?

Ideas of solution

If you already have ideas for the solution describe them here

Workflow checklist

• [ ] I discussed the issue with someone else than me before working on a solution
• [ ] I already read the latest version of the workflow for this repository
• [ ] The goal of this ontology is clear to me

I am aware that

• [ ] every entry in the ontology should have a definition
• [ ] classes should arise from concepts rather than from words

[jannahastings]

• unit is an independent continuant. Discuss, if we should classify it as generically dependent continuant.

I think it would fit better beneath generically dependent continuant.

• we have the relation _is unit of_ (RO) but no relation _has unit_
• we are currently unsing _has part_ instead. Is that clean?

I think it would be better to define a property _has unit_ . That would be clearer for users of the ontology.

[jannahastings]

Shall I implement?