Common "outlying areas" of "corporate municipality" (city) boundaries
in the USA include landfills, recycling/material storage/transfer
centers, corporation yards (equipment storage and/or service areas,
sometimes fabrication, e.g. signage), water and sewage treatment
plants, and in some cases even (city) parks and recreation areas,
such as a city-owned public golf course. It is legal, and actually
somewhat common, for boundaries of a single political entity to be
discontiguous, whether of a city or even a country.
OSM's multipolygon relation is an excellent data structure to capture
the semantics of the multiple-polygon nature of such single entities
as a city with multiple exclaves like this. However, it is crucial
to apply correct syntax of proper tags on the multipolygon relation,
as well as roles on the member polygons.
SteveA
California
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