L0 = <http://www.simantics.org/Layer0-1.1>

L0.Entity
  L0.HasConstraint L0.Entity.RelationConstraint : L0.Constraint
    L0.Constraint.Validator L0.Functions.relationValidator
  L0.HasConstraint L0.Entity.PropertyConstraint : L0.Constraint
    L0.Constraint.Validator L0.Functions.propertyValidator
  L0.HasConstraint L0.Entity.ValueConstraint : L0.Constraint
    L0.Constraint.Validator L0.Functions.valueValidator
  L0.HasConstraint L0.Entity.URIConstraint : L0.Constraint
    L0.Constraint.Validator L0.Functions.uriValidator
  L0.HasConstraint L0.Entity.ClusterConstraint : L0.Constraint
    L0.Constraint.Validator L0.Functions.clusterValidator