On 7/4/2019 11:17 PM, Joseph Eisenberg wrote:
We've also had problems with features tagged "tourism=camp_site" or "landuse=meadow" plus "barrier=hedge" or "barrier=wall". Is the barrier supposed to be an area or a linear feature in this case?
I can see the confusion here, but I think this rule still holds: Normally linear features like barrier and highway will only be interpreted as areas if tagged with area=yes. The presence of other tags which imply area is not the same as area=yes.
But it's true that this usage verges on breaking the one-feature-one-element rule -- unless you think of "fenced camp site" as a single feature, which is a bit of a stretch. Regardless, it's quite common to indicate a barrier around a 2D way by tagging it with barrier=. I don't think it's genuinely ambiguous so I doubt that it's going away any time soon, barring editor and bot intervention. (I used to see fenced=yes... but only on pretty old changesets.)
So I'd like to add a line that recommends to avoid mapping two different "feature" tags on the same database object.
Which exactly are the "feature" tags? Everything on https://wiki.openstreetmap.org/wiki/Map_Features ? Obviously building= shouldn't be included, as it's often combined with other features. I see cycleway= combined with highway= all the time. Same with sport= and leisure=, tourism= and historic=. There are many other examples of commonly used tag combinations, I'm sure. If you want to try writing a narrower list of "top-level" keys that should be mutually exclusive, give it a shot -- but I think that's going to be a short list once we run through it and find all the useful exceptions. More likely to work would be: For certain keys, a list of other keys that should not be used in combination. This list could appear as part of each section on https://wiki.openstreetmap.org/wiki/Map_Features, or as its own section on the https://wiki.openstreetmap.org/wiki/Key:* pages. It might still be difficult to get consensus on these in many cases. Jason _______________________________________________ Tagging mailing list Tagging@openstreetmap.org https://lists.openstreetmap.org/listinfo/tagging
