Please don’t understand me wrong. I’m a big fan of Wikidata but I'm against an automated import. The mismatches list gives good examples that your matching algorithm doesn't work very well: http://edwardbetts.com/osm-wikidata/mismatches.html
Some examples: 1. Isar Nuclear Power Plant <http://wikidata.org/wiki/Q569510>: your algorithm matches only one reactor of the power plant: Isar 2 <http://www.openstreetmap.org/way/32918120> but the right matching would be Kernkraftwerke Isar <http://www.openstreetmap.org/way/23802422> 2. Heligoland <http://wikidata.org/wiki/Q3038>: you’ve matched the island Heligoland <http://www.openstreetmap.org/relation/3787052> but the right match would be the municipality Heligoland <http://www.openstreetmap.org/relation/1157962> (for the island there exists a different object in Wikidata) 3. Puerto Rico <http://wikidata.org/wiki/Q1183>: the Wikidata objects says „is a unincorporated area of the United states“ – the right match therefore would be the administrative relation: Puerto Rico <http://www.openstreetmap.org/relation/306157> but your algorithm matches the island: Island of Puerto Rico <http://www.openstreetmap.org/node/357271412> I also don’t understand why you prefer nodes instead of ways or relations. Ways and relations provide more information (e.g. extent of an area) than nodes. The Matching algorithm should first look for relations, when there’s no relation it should search for ways. Nodes should come last. What does your matching algorithm when a Wikidata object describes different objects and therefore should be split? A good example for this is the Wikidata object for Thasos <https://www.wikidata.org/wiki/Q204096> (currently it describes the island and the municipality “Thasos”) but the object has to be split into two Wikidata objects so that you can say “the island Thasos lies in the administrative division Thasos”. There are also other examples like mixed up nature reserves, lakes and administrative divisions in Wikidata which you have to solve before you can import the IDs into OSM.
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