![]() ![]() Tag usage can be measured with the Taginfo application. There is no fixed dictionary of tags, but there are many conventions documented on this wiki (starting with the Map Features page). For example, you cannot have an element tagged both amenity= restaurant and amenity= bar. An element cannot have 2 tags with the same 'key', the 'key's must be unique. For example, highway= residential defines the way as a road whose main function is to give access to people's homes. Each of these are Unicode strings of up to 255 characters. Tags describe the meaning of the particular element to which they are attached.Ī tag consists of two free format text fields a 'key' and a 'value'. For example, a turn restriction would have members with "from" and "to" roles, describing the particular turn that is forbidden.Ī single element such as a particular way may appear multiple times in a relation.Īll types of data element (nodes, ways and relations), as well as changesets, can have tags. These objects are known as the relation's members.Įach element can optionally have a role within the relation. The relation is primarily an ordered list of nodes, ways, or other relations. The relation's other tags need to be interpreted in light of the type tag. Typically, the relation will have a 'type' tag. The relation's meaning is defined by its tags. Thus, relations can have different meanings.
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