gistfile1.txt

      "trip-step":{
         "description":"A step in a trip",
         "fields":[
           {
              "name":"departure",
              "type":[
                 {
                    "name":"stop",
                    "type":"stop"
                 },
                 {
                    "name":"date-time",
                    "type":"date-time-iso8601"
                 }
               ]
           }
         ]
      }