Parameter order

Section 5.1.2 says, in part:

  If the step also has literal p:parameter elements, they are are also
  considered in document order. In other words, p:parameter elements
  that appear before the parameter input may be overridden by the
  computed parameters; p:parameter elements that appear after may
  override the computed values.

Is this really necessary? No where else do we consider the order of
elements in the signature significant.

Could we just live with literal p:parameter elements always override
any provided on a port?

                                        Be seeing you,
                                          norm

-- 
Norman Walsh <ndw@nwalsh.com> | There has never been a perfect
http://nwalsh.com/            | government, because men have passions;
                              | and if they did not have passions,
                              | there would be no need for
                              | government.-- Voltaire