long modify(string ck, string xArray, yArray, array3)

This method modifies the geographic data associated with the line identified by ck.  The data provided in xArray, yArray, and optionally array3 completely replaces the data provided when the line was originally created.  These arrays need not contain the same number of elements as the original line.  (See method createLine for additional information about the preparation of these arrays.)

The following should be carefully noted:

The method returns 0 upon success, and returns error codes for the following conditions: