Reserved Words in Declarations and Program Units
All EQUEL keywords are reserved; therefore, you cannot declare variables with the same names as those keywords. In addition, the following Pascal words, used in declarations and program units, are reserved and cannot be used elsewhere, except in quoted string literals:
The word module cannot be used as an identifier in EQUEL/Pascal, although it is allowed in Pascal. The EQUEL preprocessor does not distinguish between uppercase and lower case in keywords.