[Tagging] [Voting] Feature Proposal - GTFS Tagging standard

[Zoon van Michiel]

Voting has started for a GTFS Tagging standard.
https://wiki.openstreetmap.org/wiki/Proposal:GTFS_Tagging_Standard

The aim of the proposal is to have a standardized way to reference objects in GTFS feeds. This is needed because OSM does not - and likely will never (not maintainable) - contain timetable data.
By making a GTFS feed discoverable from OSM and pointing from OSM objects to GTFS objects, we allow data consumers to find timetables.

A short summary:
1. Deprecate the `gtfs_*` namespace for the `gtfs:*` namespace
2. Deprecate `gtfs_id` and `gtfs:id` for `gtfs:stop_id` and other GTFS column names
3. Add a new feed relation with the features contained in that feed.
4. Add `gtfs:stop_id:(feed_ref)` schema for features in multiple feeds.

Changes since RFC start:
- Use `gtfs:url` instead of `gtfs:feed_url`
- Add cascading membership to solve issues with regards to relation size
- List more OSM objects for each type of GTFS object
- Allow `network` as a member
- Allow URL's that redirect tot the latest version of the GTFS feed
- Make the characterset of `gtfs:feed` less strict
- Explain the difference between `network:guid` and `gtfs:feed`
- Explain the benefit of a relation
- Explain why it is a good idea to keep the `gtfs:*` tags seperate from `ref`, `name`, ...

RFC thread: https://community.openstreetmap.org/t/rfc-feature-proposal-gtfs-tagging-standard/105763
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