[Tile-serving] [openstreetmap/osm2pgsql] Schema and/or UML illustrations (#671)

[Peter]

Yes, the basic UML is it, very clean: 

[![](https://wiki.openstreetmap.org/w/images/b/bf/UMLclassOf-osm2pgsql-schema.png)](https://wiki.openstreetmap.org/wiki/File:UMLclassOf-osm2pgsql-schema.png)

As all illustrations, have its power of summarize and consolidate information... In this case, using UML, it is also a **standard summarization**, for any one that never see OSM maps or osm2pgsql.

... I will review (the complex) Wiki documentation and community's [Osm2pgsql/schema](https://wiki.openstreetmap.org/wiki/Osm2pgsql/schema) perspective... them back here with a good and final suggestion. Perhaps proposing something to "syncronize documentations".

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PS: there are a project  that exports (or check or report) the [spatial relations](https://en.wikipedia.org/wiki/DE-9IM) and "consistence constraints"? Example: all 5570 [municipalities of Brazil](https://en.wikipedia.org/wiki/Municipalities_of_Brazil) in  *osm_polygon*  must be into (by [ST_Contains](http://www.postgis.org/docs/ST_Contains.html))  a [states of Brazil](https://en.wikipedia.org/wiki/States_of_Brazil)  of *osm_polygon*.




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