--- a/python/moving.py	Mon Oct 26 00:27:55 2009 -0400
+++ b/python/moving.py	Wed Nov 04 19:13:08 2009 -0500
@@ -56,7 +56,9 @@
 class STObject:
     '''Class for spatio-temporal object
     i.e. with temporal and spatial existence 
-    (time interval and bounding polygon for positions (e.g. rectangle)'''
+    (time interval and bounding polygon for positions (e.g. rectangle)).
+    It does not mean that the object is defined 
+    for all time instants within the time interval'''
 
     def __init__(self, timeInterval = TimeInterval(), boundingPolygon = None, num = None):
         self.timeInterval = timeInterval
@@ -76,12 +78,17 @@
         
 # return bounding box, and generic polygon, that defaults to box
 
-class Track(STObject):
+class Trajectory(STObject):
     '''Class for trajectories
-    i.e. sequence of positions'''
+    i.e. a temporal sequence of positions'''
     pass
 
 
+class TemporalIndicator:
+    '''Class for temporal indicators
+    i.e. indicators that take a value at specific instants'''
+    pass
+
 
 if __name__ == "__main__":
     import doctest