The APT Cache Specification describes the complete implementation and
format of the APT Cache file. The APT Cache file is a way for APT to parse
and store a large number of package files for display in the UI. It's primary
design goal is to make display of a single package in the tree very
fast by pre-linking important things like dependencies and provides.
The specification doubles as documentation for one of the in-memory
structures used by the package library and the APT GUI.
The APT Design Document is an overview of the specifications and design goals
of the APT project. It also attempts to give a broad descriptiontion of the
implementation as well.
The APT Files document describes the complete implementation and format of
the installed APT directory structure. It also serves as guide to how
APT views the Debian archive.
This document includes a list of all the PGPLOT subroutines,
and then gives detailed instructions for the use of each routine in
Fortran programs. The subroutine descriptions are in alphabetical
order.