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A prologue or prolog (from Greek πρόλογος prólogos, from πρό pró, "before" and λόγος lógos, "word") is an opening to a story that establishes the context and gives background details, often some earlier story that ties into the main one, and other miscellaneous information.
A prologue is a prefatory piece of writing. Prologue may also refer to: A prologue time trial, a short opening stage often used in road cycling races; Movie prologue, a stage show performed in movie theaters, mainly in the silent film era
Prolog is a logic programming language that has its origins in artificial intelligence, automated theorem proving and computational linguistics. [1] [2] [3]Prolog has its roots in first-order logic, a formal logic, and unlike many other programming languages, Prolog is intended primarily as a declarative programming language: the program is a set of facts and rules, which define relations.
The resolution method used by Prolog is called SLD resolution. If the negated query can be refuted, it follows that the query, with the appropriate variable bindings in place, is a logical consequence of the program.
The first Prolog program, also written in 1972 and implemented in Marseille, was a French question-answering system. The use of Prolog as a practical programming language was given great momentum by the development of a compiler by David H. D. Warren in Edinburgh in 1977.
The frame story of the poem, as set out in the 858 lines of Middle English which make up the General Prologue, is of a religious pilgrimage. The narrator, Geoffrey Chaucer, is in The Tabard Inn in Southwark, where he meets a group of 'sundry folk' who are all on the way to Canterbury, the site of the shrine of Saint Thomas Becket, a martyr reputed to have the power of healing the sinful.
The opposite is a prologue—a piece of writing at the beginning of a work of literature or drama, usually used to open the story and capture interest. [2] Some genres, for example television programs and video games, call the epilogue an "outro" patterned on the use of "intro" for "introduction".
A definite clause grammar (DCG) is a way of expressing grammar, either for natural or formal languages, in a logic programming language such as Prolog. It is closely related to the concept of attribute grammars / affix grammars. DCGs are usually associated with Prolog, but similar languages such as Mercury also include DCGs.