Next / Previous / Contents / TCC Help System / NM Tech homepage

14.1. census-filter

This specification function describes a function that examines a census record and can either reject it, return a modified census record, or pass it through unchanged. Such a function can do two things:

cbchistlib.py
#----------------------------------------------------------------
# census-filter ==
#   a function with calling sequence
#       f(cen)
#   and intended function
#       [ if (cen is a Census instance) ->
#           if cen is selected ->
#             return a Census instance
#           else -> return None ]