A guideline to discuss metadata keys in the schema is missing

[Ludee]

Description of the issue

As discussed today, we are missing some basic guidelines how to include or exclude keys in a metadata schema. There should be rules or guidelines that can be followed when discussing the metadata schema.

Example:

• Information should not be included twice (duplication)
• Information should not be too fluctuating (e.g. GitHub stars / downloads)

Existing resources to consider:

• https://de.wikipedia.org/wiki/Wikipedia:Relevanzkriterien
• https://gitlab.opencode.de/fitko/govdata/dcat-ap.de/-/issues

Workflow checklist

• [ ] I am aware of the workflow in CONTRIBUTING.md