Partially working draft

datasources/mtr/bus/BusStop.go

@@ -0,0 +1,27 @@
+package bus
+
+type BusStop struct {
+    RouteId string
+    Direction string
+    StationSeq int
+    StationId string
+    Latitude float64
+    Longtitude float64
+
+    Name *map[string] string
+    RouteStops *map[int] *BusStop
+}
+
+func ( busStop BusStop ) PrevStop() *BusStop {
+    if v, hasKey := (*busStop.RouteStops)[ busStop.StationSeq - 1 ]; hasKey {
+        return v
+    }
+    return nil
+}
+
+func ( busStop BusStop ) NextStop() *BusStop {
+    if v, hasKey := (*busStop.RouteStops)[ busStop.StationSeq + 1 ]; hasKey {
+        return v
+    }
+    return nil
+}