Revisit `model descriptor` and subclasses

[l-emele]

Description of the issue

The class model descriptor is currently defined as A model descriptor is an information content entity that contains information about some model. It is axiomatised as equivalent class:

'information content entity'
    and ('is about' some 'numerical computer model')

Subclasses are:

• analytical approach: A analytical approach is a model descriptor that contains information about the analysis strategy of a model.
• methodological approach: A methodical focus is a model descriptor that specifies the primary calculation method used in a model.
• model documentation: A model documentation is a model descriptor that contains a detailed description of a model.
• primary modelling purpose: A primary modelling purpose is a model descriptor stating the main purpose of a model.
• uncertainty approach: An uncertainty approach is a model descriptor that specifies how a model deals with uncertainty.

While reading those definitions, I thought whether these are rather model qualities or model functions or something like that.

Ideas of solution

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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