DARS (Data Access Routines) VS PML?

Hello there,

in Customization User Manual:

The Data Access Routines are a set of FORTRAN 77 subroutines which may be incorporated into user-written software for the purposes of navigating and manipulating the data held within a PDMS project. The anticipated use of this facility will be the creation of interfaces to other software packages, e.g. material take-off, pipe stress, isometrics, etc.

What are the Pros and Cons of DARS compared to PML and PML.NET?