How to generate OSM file from other data

I want to add new data to the existing osm file or create a completely new osm file through my new own data

There are many libraries that parse osm or pbf file, but I couldn’t find one that writes them.

If I want to write an osm file, is there only a way to add data directly according to the xml format?

I would appreciate it if you could tell me how to create a new osm file

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