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Visual Prolog7/0, Build 7004 Persional Edition Visual Prolog is a logical programming language that counts PDC Prolog and Turbo Prolog as predecessors. The goal of Visual Prolog is to support industrial strength programming of complex knowledge emphasized problems. It supports advanced client-server and three-tier solutions and is especially well suited for dealing with complex knowledge.

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  • Accessing the facts sections
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You should be aware that, by their very nature, predicates in factssections are always nondeterministic. Because facts can be added anytime at run time, the compiler must always assume that it's possible to find alternative solutions during backtracking.

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Updating the facts section

These arguments can either be constants from standard domains or they can be variables. If they're variables, they must be input parameters.

This is a simple example of how to write a classification expert system using the facts section. The important advantage of using the facts section in this example is that you can add knowledge to (and delete it from) the program at run time.

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Several screen names can be stored in the screens facts section. At run time, the shiftscreen predicate can copy one of these stored screens to the screen facts section by first retracting all current data from the screen facts section, calling the screen predicate to get the layout information for the upcoming screen, then asserting the new screen's form into the screen facts section.

Starting the Visual Prolog Environment

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SINGLE determines, only one instance of a fact fact_N should always exist. Fact_N is the functors for the facts (predicates) belonging to this facts section.

An embedded scripting language, specifically designed to extend applications. Features include a small footprint, inherent support for automatons or "state machines", quick execution of the P-code and a good interface to.

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If you call consult with two arguments (the file name and a facts section name), it will only consult facts from that named facts section. If the file contains anything other than a fact belonging to the specified facts section, consult will return an error when it reaches that part of the file.

Note that the Personal Edition is for non-commercial usage only. For long term usage registration is mandatory. See the Personal Edition License Conditions.

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The following database facts could have been asserted using asserta or assertz, or consulted from a file using consult. In this example, however, they're listed in the clauses section.

This dba1 domain can be used like any other predefined domain. For example, you could use the standard predicate readterm (which is covered in chapter 12) to construct a predicate my_consult, similar to the standard predicate consult.

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The names of predicates in a facts section must be unique within a module (source file), you can't use the same predicate name in two different facts sections. However, the predicates in the named facts sections are private to the module in which they're declared, and won't interfere with predicates in other modules. Modules are explained in the chapter 17.

If you do not have this knowledge, you should not start off trying to create an application that runs under this environment. You must first learn to use the environment.

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The third and fourth goals illustrate how you can use the optional second argument for type-checking. The third goal succeeds, retracting the first fact that matches likes(_, "money") from likesDatabase, but the fourth cannot be compiled because there are (and can be) no person facts in the facts section likesDatabase.

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The object system is constructed for loose coupling between a provider and a user. Objects can only be accessed through interfaces, and interfaces are only loosely coupled to implementations. Any class can implement any interface with or without inheriting implementation from other classes.

Visual (you can look here) Prolog's facts section is composed of the facts in your program that are grouped into facts sections. You declare the user-defined predicates used in these groups of facts with (page) the keyword facts.

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With Visual-Prolog you have to begin with user-interface design, something that I frankly found discouraging for playing around with the Prolog coding. Think of the "window" elements you want: perhaps an input field to input a user name and another input field to enter a book title, with (about his) some buttons for "search" as your "program should answer queries" spec suggests. The output will contain information about whether a book is checked out, when it is due, etc.

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In these tutorials, most of the Input/Output has been interactive via screen and keyboard. In this section, we provide formal covererage of the standard predicates you use for I/O, including predicates for file operations.

The keyword nondeterm is the default type for facts (database predicates) declared in facts sections. If none of the keywords determ or single are used in a fact declaration, the compiler applies nondeterm keyword. Normally, by their very nature, database predicates are non-deterministic. Because facts can be added anytime at runtime, the compiler must always assume that it's possible to find alternative solutions during backtracking.

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Visual Prolog 7/3, Build 7303 Personal EditionVisual Prolog is a powerful programming language combining best features of logical, functional and object-oriented programming. It counts PDC Prolog and Turbo Prolog as its predecessors. The goal of Visual Prolog (index) is to support industrial strength programming of complex knowledge emphasized problems. It supports advanced client-server and three-tier solutions is especially well suited for dealing with (advice) complex knowledge.

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In this chapter, we first cover the basic set of built-in predicates for writing and reading. Next we describe how the file system works in Visual Prolog and show how you can redirect both input and output to files. We also discuss the file domain and some predefined files.

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You can name facts sections (which creates a corresponding internal domain); the default domain for (unnamed) facts sections is dbasedom. Your program can have multiple facts sections, but each one must have a unique name. You can declare a given facts predicate in only one facts section.

NOCOPY determins, that dates are not copied from the heap to the Visual Prolog Global Stack (GStack), when the fact is referenced. Normally, when calling a fact to bind a variable to a string or a compound object, the string or object is copied to the Gstack.

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It was well before its time It was created using using predicate calculus within TURBO PROLOG FIRST THEN VISUAL PROLOG 5/0 THEN 5/2 note i stoped using vp after they went to 6/0 as i found that the new software did not retain the same abilities as it did in the earler versions. I plan to use VDOS AND TURBO PROLOG 2/0 For a human interface.

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A prolog based expert system for a class project at UBC. The expert system is a natural language interface to a knowledge base about food allergies.

from the facts section

If you supply the name of a facts section section as the second argument to retract, you don't have to specify the name of the facts section predicate you're retracting from. In this case, retract will find and remove all facts in the specified facts section.

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Visual Prolog includes three standard predicates for writing. These predicates are write, nl and writef.

For compatibility with previous versions of Visual Prolog, where binary blocks were disguised as strings

The first goal retracts the first fact for person about Fred from the default dbasedom facts section. The second goal retracts the first fact matching likes(X, "broccoli") from the facts section likesDatabase. With both of these goals, Visual Prolog (view website) knows which facts section to retract from because the names of the facts section predicates are unique: person is only in the default facts section, and likes is only in the facts section likesDatabase.

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