import interface PresentationState;
import interface PresentationMount;
interface PresentationStates<object Navigation implements PresentationState> id "presentation-states" revision "presentation-states@1" {
  queryable relation states id "presentation-states:states" : many-unique object Navigation keyed "string" {
    resolve id "presentation-states:states:resolve" execution snapshot;
  }
  operation ensure id "presentation-states:ensure" : record {presentationMount:interface-ref<PresentationMount>;occurrence:string;parent:optional<interface-ref<PresentationState>>;} -> ref<Navigation> {
    call id "presentation-states:ensure:call" execution transaction;
  }
}