This MIB module defines the textual conventions used in the enhanced image MIB. Glossary: Base Image Essential part of the operating system, which forms base functionality on top of which patches can be added. MBI (Minimum bootable image) A small image which contains the smallest possible amount of functionality required to bootstrap and load a full image. This image typically contains the kernel, the file system drivers, and some hardware initialization code. It is executed at boot-up, and initializes just enough to access the rest of the code, and run it. Modular operating system An operating system that exhibits runtime modularity characteristics, such as multiple address spaces, fault isolation between processes, and modularity delivery and replacement of image components. Patch/Package/SMU (software maintenance upgrade) A modular replacement for some piece of on-box content, such as a binary shared object, or a text file. This entity is meant to replace or augment something that is already part of the base image. Composite package Group of packages delivered as a bundle. It is meant to be loaded on MBI. Script A non-binary piece of on-box content, typically a TCL script for use by the TCL interpreter, or some other form of interpreted router content. Installable An installable can be a patch, package, composite package, SMU or script. It is a piece of software which can be loaded on to the base image on a system.