FILING AGREEMENT AMONG THE BANK OF NOVA SCOTIA AND SCOTIA CAPITAL INC. The undersigned hereby agree that the Schedule 13G with respect to the Common Shares of Westcoast Energy Inc. dated of even date herewith is and shall be filed on behalf of each of...

                                                                       EXHIBIT A



                                FILING AGREEMENT
                                      AMONG
                           THE BANK OF NOVA SCOTIA AND
                               SCOTIA CAPITAL INC.


                  The undersigned hereby agree that the Schedule 13G with
respect to the Common Shares of Westcoast Energy Inc. dated of even date
herewith is and shall be filed on behalf of each of us pursuant to and in
accordance with the provisions of Rules 13d-1(c) and 13d-1(k)(1) under the
Securities Exchange Act of 1934, as amended.


Dated: October 12 , 0000


                                   XXX XXXX XX XXXX XXXXXX


                                   By:      /s/ XXXXX XXXXX
                                      ------------------------------------------
                                   Name:   Xxxxx Xxxxx
                                   Title:  Vice-President, Group Compliance


                                   By:      /s/ XXXXXXX XXXXXXXX
                                      ------------------------------------------
                                   Name:   Xxxxxxx Xxxxxxxx
                                   Title:  Assistant Secretary


                                   SCOTIA CAPITAL INC.

                                   By:      /s/ XXXXXX XXXXXXX
                                      ------------------------------------------
                                   Name:   Xxxxxx Xxxxxxx
                                   Title:  Managing Director, Head of Equity
                                           Related Products