One of the best things about standards is the large number you have to choose from. ``Standard'' ways of storing data proliferate in all areas of computing, and astronomy is no exception.
Given this, there is a natural desire to write software that can cope
with more than one data format, but this can be a major undertaking.
This document describes features provided by the NDF library
(SUN/33) that help to make it a little easier.
Adding Format Conversion Facilities to the NDF Data Access Library