Expression1, expression2, ... are evaluated in successive steps. When one of the expressions gains the value TRUE, then actions following this expression are to be executed up to the nearest
ELSIF,
ELSE or
ENDIF. If any of the expressions does not gain the value TRUE, then the sequence of actions between the commands
ELSE -
ENDIF (they are optional) is to be executed.
If some of the expressions expression1, expression2, ... gains an invalid value, the action generates the error _ERR_EXPRESSION_STATUS.
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