PLA coding could become quite tedious if every PLA description had to specify a complete set of formats. This would especially be true if you needed to create several different PLAs to control the same hardware. It may also be the case that you don't really want your PLA coders to know all of the details of the field definitions and format definitions. The "include" statement provides a means for solving these problems. An example of an "include" statement is given below.
include "/usr/fhdl/pla/pla1"
Note that the file name is enclosed in quotes. The quotes prevent the slashes from being interpreted as division signs. A full path name, of course, is taken to be the name of the file to be included. Something other than a full path name can be interpreted in two ways. If the name of an include library is placed on the command line, all include file names are assumed to be relative to the include library. (The include library must be a directory.) If no include directory is supplied, all include file names are assumed to be relative to the current directory.