A GDR URI stripped back to its bare document _id; a non-GDR string passes through unchanged. The one canonical "URI → bare id" transform — use it wherever a stored ref (which may be a full GDR URI, or already bare) must become a lake-queryable _id.
_id
A GDR URI stripped back to its bare document
_id; a non-GDR string passes through unchanged. The one canonical "URI → bare id" transform — use it wherever a stored ref (which may be a full GDR URI, or already bare) must become a lake-queryable_id.