def METHOD_NAME(self):
    assert model["Thing"].is_a("Thing") is True
    assert model["LegalEntity"].is_a("Thing") is True
    assert model["Vessel"].is_a("Thing") is True
    assert model["Interest"].is_a("Interval") is True
    assert model["Ownership"].is_a("Interval") is True
    assert model["Ownership"].is_a("Interest") is True
    assert model["Payment"].is_a("Person") is False
    assert model["LegalEntity"].is_a("Vessel") is False
    assert model["Vessel"].is_a("LegalEntity") is False
    assert model["Ownership"].is_a("LegalEntity") is False