  {:db/id #db/id[:db.part/db]
   :db/ident :trip/wheelchair-accessible?
   :db/valueType :db.type/long
+  :db/cardinality :db.cardinality/one
+  :db.install/_attribute :db.part/db}
+
+ {:db/id #db/id[:db.part/db]
+  :db/ident :trip/frequency
+  :db/valueType :db.type/ref
+  :db/isComponent true
   :db/cardinality :db.cardinality/one
   :db.install/_attribute :db.part/db}
 


 ;; shapes
 {:db/id #db/id[:db.part/db]
  :db/ident :shape/points
  :db/isComponent true
  :db/valueType :db.type/ref

  :db/cardinality :db.cardinality/one
  :db.install/_attribute :db.part/db}

 {:db/id #db/id[:db.part/db] ; TODO: this might need to be an entity
  :db/ident :trip/block
  :db/valueType :db.type/string
  :db/cardinality :db.cardinality/one
  :db.install/_attribute :db.part/db}

