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-@startuml data-model
-!theme plain
-title Data Model Core Abstractions
-
-class attribute {
-  + hash: SHA256
-  + value: term()
-}
-
-class tuple {
-  + hash: SHA256
-  + relation: atom()
-  + attribute_map: #{name => hash}
-}
-
-class relation {
-  + hash: SHA256
-  + name: atom()
-  + tree: merkle_tree()
-  + schema: #{attr => type_relation}
-  + constraints: constraints()
-  + cardinality: {finite, N} | aleph_zero | continuum
-  + generator: function() | undefined
-  + provenance: provenance()
-}
-
-class type_relation {
-  + name: atom()
-  + erlang_type: type()
-  + membership_predicate: function()
-  + unfold_generator: function()
-  + cardinality: aleph_zero | continuum
-}
-
-class database_state {
-  + hash: SHA256
-  + name: atom()
-  + tree: merkle_tree()
-  + relations: #{name => hash}
-  + type_relations: #{name => type_relation}
-  + timestamp: integer()
-}
-
-database_state "1" *-- "many" relation : contains
-database_state "1" *-- "many" type_relation : defines types
-relation "1" *-- "many" tuple : contains
-tuple "1" *-- "many" attribute : references
-relation --> type_relation : schema references
-
-note right of attribute
-  Content-Addressed Storage:
-  - SHA-256 hash of value
-  - Automatic deduplication
-  - Immutable once stored
-
-  Value Validation:
-  Value must be member of
-  type relation specified in schema
-end note
-
-note right of relation
-  Storage Strategy:
-  - Finite: Merkle tree (materialized)
-  - Infinite: Generator (lazy)
-
-  Type Relations:
-  - Primitives: natural, integer, real, string
-  - Composite: views over other relations
-end note
-
-note left of type_relation
-  **Schema Philosophy:**
-  Attributes are typed by type relations (not primitives).
-  Types are relations (stored as infinite relations).
-  Schema validation = membership checking.
-
-  **Type Relations are Relations:**
-  They define domains via:
-  1. Erlang type constraint
-  2. Additional predicates
-  3. Unfold generator for enumeration
-
-  Examples:
-  - natural[X] :- integer[X], X >= 0
-  - complex[X] :- X is (A,B), real[A], real[B]
-end note
-
-note bottom of database_state
-  **Schema Example:**
-  employee relation schema:
-  #{
-    name => non_empty_string,  % type relation
-    age => natural,             % type relation
-    salary => positive_integer  % type relation
-  }
-
-  Each schema value is a reference to a type relation,
-  NOT a primitive type string like "integer"
-end note
-
-@enduml