A logical form is a well-formed formula, a structured set of constituents, which undergoes formal logical operations determined by its structure. 一个逻辑形式就是一个完整的公式、一套有结构的构成成分以及要经过由其结构决定的形式逻辑运作。
A well-formed derivation set is a formal denotation of a partial SLD-tree. 语义域是collection的构成的完备格,collection是将目标映射到合式推导集合的部分函数,可以看作是一个目标在推导过程中得到的部分SLD树。
The basic concept in SLD derivation semantics is the well-formed derivation set. SLD推导语义的基本概念是合式推导集合,合式推导集合是部分SLD树的形式化表示。