[Tagging] Proposal for a generic : type=multilinestring

LM_1 flukas.robot+osm at gmail.com
Thu Jan 26 14:20:36 GMT 2012

The idea itself is good, it could secure more consistent tagging and
easier automatic processing of data.

In the proposal it says:
 "If you have one way making up the line string ring and it does not
describe something in its own right, you may also put these tags on
the relation and leave the relation untagged." - that does not really
make sense to create such relation (one way tagged relation would make
splitting the way easier).

"The order of the relation members does not matter (but properly
sorted member lists can help human editors to verify completeness)." -
I believe it should be always sorted, yet routers/renderers should not
rely on it.

How would it be used in this situation?: border of two countries (A,
B) is also border of lower administrative divisions (AC, AD in country
A and BE,BF in country B). going along the border you go through
different combinations (A-B all the way; AC-BE->AD-BE->AD-BF; see
image). In reality there would be more than two levels and therefore
much more combinations.

How would it solve the case of river bifurcation if the river merges
together (river island, the same river flows on both sides)?

How would it solve similar case of streets (lanes for different
directions split for some time and later merge together)?

Thanks for answering these questions
Lukas (LM_1)

2012/1/26 sly (sylvain letuffe) <liste at letuffe.org>:
> Hi,
> I'd like your opinions on the following proposal :
> http://wiki.openstreetmap.org/wiki/Relation:multilinestring
> You are wellcome to discuss it either by replying to this email or by
> commenting on the wiki.
> I'm also willing that this proposal is used, as a first step, to replace
> http://wiki.openstreetmap.org/wiki/Relations/Proposed/boundary_segment
> which I previously proposed without public audience.
> As a independant side note :
> I am willing to activate the wiki voting system for this proposal as it seams
> most relation proposals never used it and have a tendancy to evolve in a way
> making them incompatible with their previous definitions
> --
> sly
> qui suis-je : http://sly.letuffe.org
> email perso : sylvain chez letuffe un point org
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