I'll definitely keep that in mind, thanks. Your correction looks good to me. Cheers.

Thanks for letting me know. I admit not being aware of this licensing issue. I have been using Wikipedia as a source to double check information before upload. I won't do it anymore. Thanks.

Hi Warin61. I guess, I wasn't very clear with my source tag. I didn't import any data from Wikipedia, the multipolygon was an original creation, roughly mapping my basic knowledge of the Great Sandy Strait. I actually only used Wikipedia to double check the spelling. I should have mapped with the tag "source=local knowledge" at that time I suppose, my bad. I have spent quite a long time mapping the straits, none of it which was imported from anywhere. It'd be a real shame to see this relation deleted.

Sources:
- https://zh-yue.wikipedia.org/wiki/%E9%B9%B9%E7%94%B0
- https://www.afcd.gov.hk/tc_chi/country/cou_vis/cou_vis_cou/cou_vis_cou_ske/cou_vis_cou_ske.html

Yes, maybe. He seems to have stopped editing for the past 3 months though.

Oh I see. I don't have time to check Admiralty station now.

I'm not sure what that means but cantor34 has a very unusual activity with a huge amount of edits, throughout the world, and in a very short time.

Done. Not sure what you mean by "merge the relations at Admiralty station" though.

@jc86035 There is a tagging guideline for Hong Kong MTR station (osm.wiki/Zh-hant:Hong_Kong_tagging#.E9.90.B5.E8.B7.AF_Railway) which seems to match the general conventions (osm.wiki/Railway_stations#Building). My understanding of it is the concourse outline should be mapped with both railway=station and
building=train_station.

I would say it is rather important to avoid having railway=station duplicates as it is the case with many stations in Hong Kong, where both one node and the concourse way use the tag railway=station. As shown in this diagram osm.wiki/Railway_stations#Overview there is only one railway=station object, either a node or an area.

I'm not sure why Sai Ying Pun station renders above the buildings. The tag layer=-3 should prevent that. I don't know what's going on here. But in any case "don't tag for the renderer" (osm.wiki/Tagging_for_the_renderer).

I'm not sure if highway=footway would be correct for concourses as it will imply that one can walk anywhere within that area. But these areas includes shops and the entire platform outline but we can't physically walk all around the platform and on the tracks. But I might be wrong. Having all the foot ways (either with as ways or areas), escalators, travelators and lifts would be really nice for sure. But seems like a lot of fairly complex work that could easily be broken by any non-expert mapper. I'll leave that to others and would rather focus on station outlines and entrance for now.