Yes.
Add a d-tag with a uuid. That uuid corresponds to the subject of the document.
Then create a new private key to sign the event.
Anyone you share the private key with can continue editing the document by creating new event with the same uuid and same key.
Everyone else can “fork” the document. They do it by creating a new event and using the same uuid in the d tag.
People don’t have to use the same uuid when creating a new document on the same topic. But they have incentive to do so. If your document about Blue Whales already got traction, I would want to use the same uuid to suggest my document as an alternative document for the same topic.
When creating a new version, one can also add his personal pubkey in a p-tag so people know who created this version.
