Function app_authorship 

pub fn app_authorship(workspace: &str, app: &str, granted_by: Subject) -> Grant

The grant making application app an author of its own records in workspace: it reads and changes what it keeps there as the person using it, and reaches nothing outside it. Another app’s actions in the workspace stay behind the workspace’s own grants and the person’s consent. Given when a person who may change the workspace opens the app.