[ns] question about ns-lib.tcl

[Andronikos Nedos <nedosa@cs.tcd.ie>]

Hi all,
I am trying to derive an ad-hoc location aware routing protocol by 
modifying DSR.
Modifying the source I have run upon ns-lib.tcl and noticed that 
although the format to
create a wireless node has changed from 
{routing-protocol}-create-mobile-node to
$ns_ node-config [list-of-parameters] ,  ns-lib.tcl still sources 
mobility/dsr.tcl which
is there to provide access to the old node creation structure.
Is there any reason that this is being done apart from compatibility ?

Thanks a lot,
    - Andronikos