oekg-specific annotations are needed

[l-emele]

Description of the issue

ideas from OEKG:

• annotation for classes that oekg should neglect: oekg ignore = true
• annotation to indicate study descriptors [SFS] Improve list of keywords / descriptors oekg#19 (comment)

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

[l-emele]

annotation for classes that oekg should neglect: oekg ignore = true

Probably not the oekg should ignore these classes but the scenario factsheet, right?

[l-emele]

Issue OpenEnergyPlatform/oekg#19 in the OEKG has shown a potential second use case: to mark classes that could be used as a descriptor in a bundle.

So what about: An annotation that specifies how an entity should be used by the OEKG or the scenario bundles.
Allowed values:

• ignore: Entity will not by shown in hierarchical structures (e.g. of sectors or energy carriers)
• descriptor: Entity will be used in the scenario bundles as option to be selected as descriptor.

[stap-m]

Since the descriptor annotation is requested for in OpenEnergyPlatform/oeplatform#1718 again, and there is an agreement on that in OpenEnergyPlatform/oekg#19, I will add this annotation now, so that it can be used for the bundles.