It extracts process information from the proof tree by analyzing every node of resolution proof tree to extract procedure . and the partial correctness of the extracted procedure is proved 這一方法的特點(diǎn)是,抽取算法的時(shí)間、空間復(fù)雜度都是線性的,并且抽取算法本身十分簡單,易于實(shí)現(xiàn)。