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-@startuml constraint-classification
-!theme plain
-title Constraint Classification (McGoveran Framework)
-
-package "Database Constraints" {
-  class RelationConstraints {
-    Which relations must/can exist
-    Example: referential integrity
-  }
-
-  class CardinalityConstraints {
-    Relation size limits
-    Examples:
-    - exactly N tuples
-    - at most M tuples
-  }
-}
-
-package "Relation Constraints" {
-  package "Tuple Constraints" {
-    class AttributeConstraints {
-      Domain constraints per attribute
-      Examples:
-      - age >= 18
-      - salary > 0
-      - name ≠ ""
-    }
-
-    class TupleLevelConstraints {
-      Cross-attribute rules
-      Example:
-      if salary > 200k then age >= 30
-    }
-  }
-
-  package "Relation-Level Constraints" {
-    class KeyConstraints {
-      Uniqueness + not null
-      - Primary keys
-      - Candidate keys
-      - Composite keys
-    }
-
-    class FunctionalDependencies {
-      A → B
-      Example: ZIP → {city, state}
-    }
-
-    class ForeignKeys {
-      Inclusion dependencies
-      Example: employee.dept_id ⊆ department.id
-    }
-  }
-}
-
-package "Transition Constraints" {
-  class StateTransitionRules {
-    Before → After constraints
-    Examples:
-    - salary (monotonic increasing)
-    - created_at (immutable)
-  }
-
-  class TemporalConstraints {
-    Time-based rules
-    Example: end_date >= start_date
-  }
-}
-
-package "Multi-Relation Constraints" {
-  class AggregateConstraints {
-    Cross-relation aggregates
-    Example: sum(dept_salaries) <= dept_budget
-  }
-
-  class MutualExclusion {
-    Disjoint sets
-    Example: managers ∩ ICs = ∅
-  }
-}
-
-@enduml