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not 함수는 불린식을 평가하고 반대값을 반환합니다.
not
not(expression )
expression
식은 마치 boolean() 함수에 인수로 넘겨진 것처럼 정확히 평가됩니다.
false로 평가한 식은 true; true로 평가한 식은 false.
XPath 1.0 4.3
지원함.