A function-identifier is a sequence of character strings and separators that uniquely references the data item that results from the evaluation of a function.
Format >>-FUNCTION--function-name-1--+----------------------+----------> | .------------. | | V | | '-(----argument-1-+--)-' >--+--------------------+-------------------------------------->< '-reference-modifier-'
For more information, see Intrinsic functions.
A function-identifier that makes reference to an alphanumeric or national function can be specified anywhere that a data item of category alphanumeric or category national, respectively, can be referenced and where references to functions are not specifically prohibited, except as follows:
A function-identifier that makes reference to an integer or numeric function can be used wherever an arithmetic expression can be used.