Hi,
Phil! Gold wrote:
Why is this so logical? The exact same data can be derived from the
intersection of the sets of elements in the two countries' (single-level)
border relations.
Put yourself in the position of having to create or maintain them.
Creation:
Cascading relations: You create ONE relation that contains all the ways
making up the border between A and B (finding them is a cumbersome
manual process). Then you create two relations for the two countries,
each time adding only 4 or 5 sub-relations.
Single-relation approach: You create TWO relations that each contain all
the ways making up the border between A and B (plus a lot more).
Maintenance:
Cascading: You split a way on the border between A and B. The newly
created way is added to one relatively small relation and that's it.
Single-relation: The newly created way has to be added to two very large
relations which you will have to first download and later upload as a
whole.
Single-relation also has the higher risk of edit conflicts.
It seems to me that because both shcmes can satisfy the
use case, the preferable approace would be the simpler one, which I see as
being the single-relation approach.
Simpler for reading, but, as explained above, more difficult/problematic
for maintenance.
Bye
Frederik
--
Frederik Ramm ## eMail [email protected] ## N49°00'09" E008°23'33"
_______________________________________________
talk mailing list
[email protected]
http://lists.openstreetmap.org/listinfo/talk
