[Tagging] start_date variants

[Stephan Bösch-Plepelits]

Hi!

I have some thoughts in the start_date tag, as I find it a bit too vague -
meaning start of what?

Example: There is this museum, which openened in 2011, but the building is
much older, it was built in 1725: https://www.openstreetmap.org/relation/1937535

An option would be to prefix start_date with the key of the indicating tag,
e.g. amenity:start_date would describe the start_date of the current
amenity. So, non-prefixed start_date would apply to all other tags.

This seems to be quite popular anyway, but I don't know if this ever has
been agreed upon - at least it's not documented as such:
https://taginfo.openstreetmap.org/search?q=start_date

For the museum, which I mentioned before, I used the following tags:
- start_date=2011
- building:start_date=1725

Other remarks:

It would also be interesting to be able to tag the start of construction -
often construction starts many years before the building is finshed:
Airport BER in Berlin, Germany or La Sagrada Familia in Barcelona, Spain
are famous examples. How to tag this? Maybe: construction:start_date?

Any thougths on this?

greetings,
	Stephan

PS: OpenStreetBrowser has a category which shows building:start_date resp.
start_date: https://www.openstreetbrowser.org/#categories=buildings-start_date

PS: I even found, that people translate 'start_date' by using a language
suffix (e.g. start_date:fr, start_date:ja):
- https://taginfo.openstreetmap.org/keys/start_date%3Afr#values
- https://taginfo.openstreetmap.org/keys/start_date%3Aja#values
I wrote a node module which can translate start_date values (English,
German, French available). Pull requests welcome!
https://github.com/plepe/openstreetmap-date-format
-- 
Seid unbequem, seid Sand, nicht Öl im Getriebe der Welt! - Günther Eich
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| Stephan Bösch-Plepelits  ❤ code ❤ urbanism ❤ free software ❤ cycling |
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