The /ELSEIF compiler directive is used to test a condition expression within an /IF or /ELSEIF group. The following entries are used for /ELSEIF:
If the previous /IF or /ELSEIF was not satisfied, and the condition expression is true, then source lines following the /ELSEIF directive are selected to be read. Otherwise, lines are excluded until the next /ELSEIF, /ELSE or /ENDIF in the same /IF group is encountered.