CLIPS provides a set of functions to build and access a hierarchical
lookup system for multiple external files. Each file contains
a set of text entries in a special format that CLIPS can later
reference and display. The basic concept is that CLIPS retains
a ìmapî of the text file in memory and can easily
pull sections of text from the file without having to store the
whole file in memory and without having to sequentially search
the file for the appropriate text.
13.15.1 External Text File Format
13.15.2 External Text Manipulation Functions