Example: Packing-lists (cont.)

Good validation: one single piece of code reads it all, and writes it all
No need to rewrite it all the time, so there are lots of new tools
check-lib-depends (267 lines)
check-common-dirs (192 lines)
find-all-conflicts (201 lines)
pkg_mklocatedb (121 lines)
...
make-plist (1093 lines)