restructure the concept of regions #1745

[viktorwichern]

Summary of the discussion

While discussing Issue #1489 with the OVGU-Group, we agreed that the current structure of spatial region should be slightly changed.
One reason for that is the fact that study region considered region and interacting region are currently on the same hierarchical level as one-two-three and zero-dimensional region.

We decided to add a meta concept that contains the different regions and to make the regions equivalent classes by adding corresponding roles.

Since subregion was only parent to study subregion, which was not related in any way to study region, I moved subregion under the new meta-class and implemented a corresponding study subregion role, which is a child node of study region role.

For now, I copied the examples of use from the regions, which means that they are part of both the role, and the equivalent class, which one could argue is somewhat superfluous.

New concepts:

region of relevance:
definition: A region of relevance is a spatial region that is mentioned in any study or analysis.

study region role:
definition: A study region role is a role of a region of relevance that is under investigation and consists entirely of one or more subregions.

study subregion role:
definition: A study subregion role is a study region role that refers to a subregion.

interacting region role:
definition: An interacting region role is a role of a region of relevance that interacts with a region of relevance that has the study region role. It is part of a region of relevance that has the considered region role, but not a study region role.

considered region role:
definition: A considered region role is the role of a region of relevance that is used in an analysis.

Updated definition:

subregion:
definition: A subregion is a region of relevance that is in every respect a component of a region of relevance, but never encompasses the entire extent of a region of relevance.

Type of change (CHANGELOG.md)

Added

• region of relevance
• study region role
• interacting region role
• considered region role
• study subregion role

Updated

• subregion

Workflow checklist

Automation

Closes #1745

PR-Assignee

• 🐙 Follow the Pull Request Workflow
• 📝 Update the CHANGELOG.md
• 📙 Add #'s to term tracker item

Reviewer

• 🐙 Follow the Reviewer Guide
• 🐙 Provided feedback and show sufficient appreciation for the work done

[l-emele]

Please add to all new region roles the axiom 'has bearer' some 'region of relevance'.