On 05/mag/2013, at 12:28, Christoph Hormann <[email protected]> wrote:

> 1) duplicate the way
> 2) tag natural=coastline;whatever
> 3) create a multipolygon relation containing a single way with natural=*
> 
> I used option 3 but i could not find any definitive answer to this 
> question so i will leave it open for discussion.


+1, I'd also use 3
2 is generally discouraged and 1 is far less elegant, heavier on the db and an 
annoyance to edit. Also, the coastline _is_ the border of the island, with var. 
1 it would look like a simple coincidence, so also semantically IMHO 3 is 
preferable.

cheers,
Martin
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