you can see an example of the format if you go the play.authzed.com and click "download" - it's basically the contents of each of the four tabs in the playground under four keys in yaml (here's an example: https://gist.github.com/ecordell/fe3c81f753a5c425610a8b39accfb97c) and yes the import operation for one of these files is idempotent: it overwrites the schema (replacing what was there) and it writes the relationships with a "touch" operation