Collaboration for Kotoba on Issho: Issho is the document's authority, its people and their cursors; Kotoba is the document and its editor.

Your Issho policy names Kotoba's documents with document/1, the editor joins with its issho option (Issho.Join's keys, as every component of the page, and Kotoba's :undo), and the application's JavaScript imports kotoba/collab once. Changes from your own code go through Kotoba.Issho.change/4. See the Collaboration guide.