Proposal:
- Reinstate
gtfs:feed - Define
gtfs:feed+ non-subkeyed GTFS tags as the authoritative feed for this feature - Use
gtfs:[tag]:[feed_code]for all other GTFS objects that correspond to this object, even if slightly different.
Automated tools may only modify geometry/tags outside the gtfs namespace if it sources it’s data from the gtfs:feed feed (and care should still be taken).
Automated tools may always modify GTFS tags for the feed they source from.
In the Hamburg - Copenhagen example, one feed should be chosen as authoritative (probably the one of the Denmark/DSB as they have the longer section). The other (Germany/DB) should be tagged as a secondary feed.