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+== GeoFence DSL ==
+Allow users to write javascript to do what they want to with geofence events.
+Attach a code blob to a fence, to automatically be run on any event for that fence.
+Attach a blob to the user account to run on any fence event.
+Variables
+<code>
+event = { "fence" : <The specific fence that caused the event>
+           "date" : <trigger date>
+           "verb" : "IN" | "OUT"
+         }
+fences[] - access to each of the user defined geofences
+fence = {
+     "name" : "Bob's GeoFence",
+     "geometry": {
+        "type": "Polygon",
+        "coordinates": [
+          [ [100.0, 0.0], [101.0, 0.0], [101.0, 1.0],
+            [100.0, 1.0], [100.0, 0.0] ]
+          ]
+      } /* from http://locationcommons.org/index.php?title=GeoFence */
+inside_fences[] - list of fences currently "inside"
+</code>
+Send an email on every fence crossing (blob attached to the user)
+<code>
+ if event.verb == "IN" {
+    email("don@don", "Fence entered!")
+ }
+</code>
+Send an email if I'm at the ACE for 10 minutes (blob attached to the fence)
+<code>
+ if (event.verb == "IN") {
+    if ((new Date()) - fence.inside_trigger_time > 10.minutes) {
+      email("brennan", "Nerdout at the ACE Hotel!")
+    }
+ }
+</code>