On 3/10/22 19:01, Peter Elderson wrote:
A feature is not a tag or a key, it's an object in the OSM database. I don't
know which features are primary, secondary, ... and why. Anyway, the term
primary feature is not equivalent to main key or main tag.
Feature = real world object.
Real world features are 'translated' into OSM using tags.
In OSM the real world feature would have a single tag to say 'what it
is', a highway, a building etc. This would be the main tag (main key +
main value)
Other tags such as colour, height, elevation as descriptive details of
the real world feature.
That make some sense?
Talking about e.g. roads, the main key is highway= because that key defines the
feature as a road or road component. Talking about a particular road, the
highway=* tag is the main tag because it defines the type of the road or road
component.
So main key and main tag are more or less alike, but not equivalent.
Tag to me is the combination of the key and the value .. eg {tag |
highway | service }
Feature tag is a vague term. I suppose it means: an attribute of an object, as
opposed e.g. to an attribute of a changeset.
I'd try not to use 'feature' and 'tag' together like that, keeping
'feature' for the real world and 'tag' for OSM.
Mvg Peter Elderson
Op 3 okt. 2022 om 04:06 heeft Minh Nguyen <[email protected]> het
volgende geschreven:
Vào lúc 10:36 2022-10-02, martianfreeloader đã viết:
Hi,
I'm unsure if I'm using correct terminology. I have come across these terms in
the OSM ecosystem:
- primary feature [1]
- main key [2]
- primary key [3]
- feature tag [4]
1) Are these synonyms (except for the key/tag distinction)?
2) Is *one* of these terms "official" OSM speek with a clear definition?
(as is the case for things like "node", "way", "relation", "key", "value", "tag",
"changeset")
"Primary feature" appears in the Collective Database Guideline Guideline [sic] and
Geocoding community guideline, which clarify the terms of use under the ODbL. [1][2] "Feature
type" appears in the Horizontal Map Layers community guideline. [3]
[1] https://wiki.osmfoundation.org/wiki/Special:PermanentLink/3980#The_Guideline
[2]
https://wiki.osmfoundation.org/wiki/Special:PermanentLink/4907#How_does_the_guideline_relate_to_other_existing_guidelines?
[3] https://wiki.osmfoundation.org/wiki/Special:PermanentLink/3982#The_Guideline
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