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type multigroup_description = string BatMap.String.t
type origin = {source: string list; attribute: string}
type attribute_description = {domain: string; provenance: origin list}
type relation_description = attribute_description BatMap.String.t
type tuple_description = {relation: relation_description; attributes: string BatMap.String.t}
(* TODO: For now the description is completely detached from actual
types and domains. Later figure out a way to represent the links
without strings. *)
type description =
| Multigroup of multigroup_description
| Relation of relation_description
| Tuple of tuple_description
class type implementation = object
method describe : unit -> (description, Concepts.Condition.condition) result
end
type Handle.protocol += Schematics of implementation
type t = implementation
let make impl = Schematics (impl :> implementation)
let from handle = Handle.into handle (function Schematics impl -> Some impl | _ -> None)
let describe impl = Handle.invoke impl (fun o -> o#describe ())
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