I’m now taking a look on Ichi-Sansho-Joho data from MLIT, Japan. This is quite powerful dataset about place name, and could be used as OpenStreetMap edits. (include imports, although it is not fully activated)

osm.wiki/JA:MLIT_ISJ

Seeing Japanese place/address name sample structure, some errors might be contained. This is a note for further works.

https://docs.google.com/spreadsheets/d/1eAE72mjCLoJVGZo5qRhCYK22UxVQ8bpbQSU9ZLHq40o/edit#gid=0

• “11”,”埼玉県”,”11234”,”八潮市”,”112340013002”,”大字二丁目”,”35.821729”,”139.846276”,”0”,”3”

-> Code 3 could be error. Code 1 would be correct. This is quarter named “大字二丁目”. Despite of “丁目” is included.

• “27”,”大阪府”,”27145”,”堺市南区”,”271450017000”,”竹城台四丁”,”34.498107”,”135.500217”,”0”,”1”
• “27”,”大阪府”,”27145”,”堺市南区”,”271450035000”,”竹城台二丁”,”34.498169”,”135.505486”,”0”,”1”
• “27”,”大阪府”,”27145”,”堺市南区”,”271450074000”,”竹城台三丁”,”34.493790”,”135.503225”,”0”,”1”
• “27”,”大阪府”,”27145”,”堺市南区”,”271450075000”,”竹城台一丁”,”34.500963”,”135.510525”,”0”,”1”

-> Probably original structure is correct, but “n丁” should be devided in the case of use for OSM. Those are Code 1 column, but should be treated as variant of Code 3.

• “04”,”宮城県”,”04103”,”仙台市若林区”,”041030090000”,”蒲町東”,”38.245498”,”140.932557”,”0”,”3”
• “07”,”福島県”,”07207”,”須賀川市”,”072070142000”,”北山寺町”,”37.30542”,”140.364113”,”0”,”3”
• “07”,”福島県”,”07207”,”須賀川市”,”072070143000”,”西山寺町”,”37.303127”,”140.358357”,”0”,”3”
• “07”,”福島県”,”07207”,”須賀川市”,”072070144000”,”山寺町”,”37.302309”,”140.364716”,”0”,”3”

-> Code 3 might be error. I guess those lines should be Code 2.

And Code 3 lines (丁目) should be divided into 2 nodes. (quarter (町名) and neighbourhood (丁目).) Some quarter might be duplicated to Code 1 lines.

And it seems “釧路市昭和”（大字, quarter）and “釧路市昭和町” are same district, but need more check if it is correct.