By Clive Matthews
Introduces the topic in the course of the dialogue & improvement of assorted machine courses which illustrate the various simple thoughts & strategies within the box. The programming language used is Prolog. Paper.
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Extra resources for An Introduction to Natural Language Processing Through Prolog
As with constants, distinct variable names stand for distinct objects. Instantiating the variable to a value results in all other instances of the variable within the same goal being similarly instantiated. - spoken_in(X, X) . because there are no s p o k e n _ i n facts where the first and second arguments are identical. There is a special variable in Prolog called the a n o n y m o u s vari able. This is represented by the underscore, _ . It is used on those occasions when we do not care what value is assigned to a variable, only that an assignment exists.
After having pressed the R E T U R N key, Prolog will reply with a y e s since it is able to confirm that, according to its p r o g r a m , English is spoken in the United K i n g d o m . - spoken_in(piro, uk). will result in a n o response since the system is unable to verify that Piro is spoken in the United K i n g d o m . A yes-no question in Prolog looks just like a fact except that it is preceded by the system p r o m p t . Indeed, both facts and questions have the same syntax. In order to distinguish between the t w o , a question will be called a g o a l .
Asking Simple Questions in Prolog 41 The interpreter searches for a match by checking each fact in turn. T h e facts are examined in the same t o p - d o w n order as they appear in the file. If a match is found, the system reports the satis faction of the goal by printing y e s on the screen. A goal that is not satisfiable is said to fail. In such cases n o is returned to the screen. This description explains Prolog's responses to the earlier ques tions. Given the goal s p o k e n _ i n ( e n g l i s h , u k ) , a match is pos sible with the very first fact in the program; hence, Prolog's y e s .