1	import Base
2	import ./entity_key.bend as Key
3	import ./snapshot_data.bend as Basic
4	import ./decode_data.bend as D
5	import ./relation_types.bend as G
6	
7	type Group is Data:
8	  Group{target:Key.Key,sources:List<&2,Key.Key>}
9	type Relation is Data:
10	  Relation{name:String,groups:List<&2,Group>}
11	type Snapshot is Data:
12	  Snapshot{basic:Basic.Snapshot,relations:List<&2,Relation>,machines:List<&2,D.Field>}
13	type Error is Data:
14	  UnknownRelation{name:String}
15	  InvalidRelation{name:String,source:Key.Key,target:Key.Key}
16	  UnknownMachine{name:String}
17	  InvalidMachineState{name:String,value:D.Raw}
18	type GraphResult<S:Data> is Data:
19	  Accepted{graph:G.Graph<S>}
20	  Rejected{error:Error}