type Point = record { x:double; y:double; };
type Entry = variant id "canvas:entry@1" {
  paragraph id "canvas:paragraph" : record { text:string; };
  stroke id "canvas:stroke" : record { points:list<Point>; };
  image id "canvas:image" : record { asset:string; };
};
interface CanvasContent id "canvas" revision "canvas@1" {
  queryable value entries id "entries" : list<Entry> {
    get id "entries:get" execution snapshot targets [browser,server];
    edit id "entries:edit" execution transaction targets [browser,server];
  }
}