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For describing predicate parameters in the javadoc we use '+' as indicator for input mode and '-' as indicator for output mode (see [1,2]). [1] https://www.swi-prolog.org/pldoc/man?section=preddesc [2] https://stackoverflow.com/questions/4220651/question-mark-plus-minus-preceding-prolog-variable-names Signed-off-by: Edwin Kempin <ekempin@google.com> Change-Id: I3195563311fbca02b7f42100fa1e90a8fc90746d