enable reverse linkage, how?

[pvgenuchten]

When record A links to B, how can a user be aware of a linkage from B to A?

• serverside; include reversed B-A linkage to record B at request time
• clientside; run a query to retrieve all records which link to B (is such a query possible in ogcapi-records or csw? no queryable field seems available)

[github-actions]

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