<p>Yes, the basic UML is it, very clean:</p>
<p><a href="https://wiki.openstreetmap.org/wiki/File:UMLclassOf-osm2pgsql-schema.png"><img src="https://camo.githubusercontent.com/f6c2e5d0f049d7b50a51cef765fb803eb0aa5c8e/68747470733a2f2f77696b692e6f70656e7374726565746d61702e6f72672f772f696d616765732f622f62662f554d4c636c6173734f662d6f736d32706773716c2d736368656d612e706e67" alt="" data-canonical-src="https://wiki.openstreetmap.org/w/images/b/bf/UMLclassOf-osm2pgsql-schema.png" style="max-width:100%;"></a></p>
<p>As all illustrations, have its power of summarize and consolidate information... In this case, using UML, it is also a <strong>standard summarization</strong>, for any one that never see OSM maps or osm2pgsql.</p>
<p>... I will review (the complex) Wiki documentation and community's <a href="https://wiki.openstreetmap.org/wiki/Osm2pgsql/schema">Osm2pgsql/schema</a> perspective... them back here with a good and final suggestion. Perhaps proposing something to "syncronize documentations".</p>
<hr>
<p>PS: there are a project  that exports (or check or report) the <a href="https://en.wikipedia.org/wiki/DE-9IM">spatial relations</a> and "consistence constraints"? Example: all 5570 <a href="https://en.wikipedia.org/wiki/Municipalities_of_Brazil">municipalities of Brazil</a> in  <em>osm_polygon</em>  must be into (by <a href="http://www.postgis.org/docs/ST_Contains.html">ST_Contains</a>)  a <a href="https://en.wikipedia.org/wiki/States_of_Brazil">states of Brazil</a>  of <em>osm_polygon</em>.</p>

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