@Override
    public String toString() {
      return "OsmRelation[" + id() + ']';
    }
A {@link MultiPolygon} created from an OSM relation where {@code type=multipolygon}.
<p>
Delegates complex reconstruction work to {@link OsmMultipolygon}.
planetiler-core/src/main/java/com/onthegomap/planetiler/reader/osm/OsmReader.java