# Endpoint bounds. A child has exactly two parents, which none of the four named
# multiplicities can express.
lpg: "1.0"
namespace:
  prefix: kin
  iri: https://example.org/vocab/kin#

nodes:
  Person:
    id: n_pers
    key: [ssn]
    props:
      ssn:  { id: p_ssn, type: STRING, required: true }
      born: { id: p_born, type: DATE }

  Passport:
    id: n_pass
    key: [number]
    props:
      number: { id: p_num, type: STRING, required: true }

edges:
  # Exactly two. SHACL enforces this; LadybugDB reports that it cannot.
  HAS_PARENT:
    id: e_par
    from: Person
    to: Person
    cardinality: { to: "2" }

  # At most one passport per person, at least one holder per passport.
  HELD_BY:
    id: e_held
    from: Passport
    to: Person
    cardinality: { from: "0..1", to: "1..*" }