一本prolog方面的英文原版电子书，讲得很通俗易懂，原理介绍的比较清晰，例子都可以拷贝到解释器中执行，适合入门使用，个人觉得很不错-A prolog aspects of the English original e-books, very readable, introduction of the principle of relatively clear, for example, can be copied to the in