devel Development Tools APT Cache Specification /usr/doc/apt/cache.html/index.html 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. devel Development Tools APT Design Document /usr/doc/apt/design.html/index.html The APT Design Document is an overview of the specifications and design goals of the APT project. It also attempts to give a broad description of the implementation as well. devel Development Tools DPkg Technical Manual /usr/doc/apt/design.html/index.html The DPkg Technical Manual gives an overview of dpkg's external functions and describes how it views the world. devel Development Tools APT Files /usr/doc/apt/files.html/index.html 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. devel Development Tools APT Method Interface /usr/doc/apt/files.html/index.html The APT Method Interface document describes the interface that APT uses to the archive access methods.