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<noinclude>__NOTOC__== Glossary ==</noinclude>
<includeonly>= Glossary =</includeonly>
<noinclude>{{PrF_UG}}<div id='prf_ug'></noinclude>

This Glossary defines terms used in this description of {{#var:Pr}}.
It is not meant to be an exhaustive list of terminology associated with object-oriented modeling.

=== Abstract Class ===

An abstract class cannot have instances.
It is identified with a hollow round icon
(e.g., [[Image:PrF_UG_classes_class.abstract.gif|classes_class.abstract]]
or [[Image:PrF_UG_classes_class.metaclass.abstract.gif|classes_class.metaclass.abstract]]).

=== Allowed Classes ===

A constraint on the values of a type-instance slot.
The value of the slot can only be an instance of the class
(or any of its children) in the Allowed Classes list.

=== Application ===

The program that combines the {{#var:Pr}} knowledge base with a problem-solving method,
so that end users can use a {{#var:Pr}} knowledge base to solve a problem. 

=== Boolean ===

A type of slot with a true or false value.
Boolean slots appear as checkboxes in {{#var:PrF}}.
A checked box signifies a true value. 

=== Browser Key ===

The browser key of a class is one of its slots whose value is displayed
when instances of this class are referred to by other instances' forms.

=== Cardinality ===

A slot facet that describes whether the slot has just one value (''single'')
or more than one value (''multiple'').
In {{#var:PrF}}, Single is the default. 

=== Class ===

An abstract representation of a concept in a domain as a collection of related classes.
For example, a medical model might have ''protocol'', ''guidelines'',
and ''patient data ''as classes.
A class appears with a round gold icon in {{#var:PrF}}
(e.g., [[Image:PrF_UG_classes_class.gif|classes_class]],
[[Image:PrF_UG_classes_class.abstract.gif|classes_class.abstract]],
[[Image:PrF_UG_classes_class.metaclass.gif|classes_class.metaclass]],
or
[[Image:PrF_UG_classes_class.metaclass.abstract.gif|classes_class.metaclass.abstract]]).
A class can have a set of slots that represent the attributes of the class.

=== Classes Tab ===

The {{#var:PrF}} part used to create, view, revise, and save classes. 

=== Concrete Class ===

Concrete classes can have instances.
They are identified by a solid round icon
(e.g., [[Image:PrF_UG_classes_class.gif|classes_class]]
or [[Image:PrF_UG_classes_class.metaclass.gif|classes_class.metaclass]]).

=== Direct Slot ===

A slot which is attached directly to a class (in contrast to a slot which is inherited).

=== Domain ===

A particular field of knowledge, such as breast cancer.

=== Facet ===

An attribute of a slot.
Some facets depend on the value of the type facet.
For example, an integer slot type has facets for Minimum and Maximum.

=== Float ===

A positive or negative real numeric value
(e.g., 1.0, 3.4e10, -0.3e-3), used as a slot value.

=== Forms Tab ===

The {{#var:PrF}} part used to create the forms for acquiring instances of classes.
It may also be used to view, revise, and save the forms. 

=== Frame ===

A frame is a primitive object that represents an entity in the domain of discourse.
In {{#var:PrF}}, a frame can represent a class, slot, facet, or instance. 

=== Inheritance ===

A parent-child (superclass-subclass) relationship between two classes.
A child (subclass) inherits the slots of its parent classes (superclasses).

=== Inherited Slot ===

A slot that is attached to a class via inheritance from a superclass.

=== Instance <b>(KB value)</b> ===

Concrete occurrence of information about a domain that is entered into a knowledge base.
For example, Fran Smith might be an instance for a Name slot.
An instance is entered via a form generated by {{#var:PrF}}. 

=== Instance <b>(slot type)</b> ===

A type of slot whose value is the instance of a class.

=== Instances Tab ===

The {{#var:PrF}} part used to acquire instances of classes.
It may also be used to view, revise, and save the instances. 

=== Integer ===

A positive or negative whole number (e.g., 1, 2, -4),
used as a slot value.

=== Knowledge-acquisition tool ===

A tool used to build a knowledge base by acquiring instances.
In {{#var:PrF}}, the forms comprise the KA tool. 

=== Knowledge base (KB) ===

A set of instances of classes which may be used by PSMs.

=== Knowledge-based system ===

A computer system that includes a knowledge base about a domain
and programs that include rules for processing the knowledge
and for solving problems relating to the domain.

=== Metaclass ===

A template; that is, a class whose instances are themselves classes.

=== Ontology ===

A model of a particular field of knowledge - the concepts and their attributes,
as well as the relationships between the concepts.
In {{#var:PrF}}, an ontology is represented as a set of classes with their associated slots. 

=== PAL ({{#var:Pr}} Axiom Language) ===

A plugin toolset that comprises engines
for checking constraints and running queries on knowledge bases,
as well as a set of useful user interface components.

=== .pins file ===

A {{#var:PrF}} file in CLIPS format that contains instances. 

=== .pont file ===

A {{#var:PrF}} file in CLIPS format that contains an ontology. 

=== .pprj file ===

A {{#var:Pr}} file that contains a project.
A project file contains the customized form information
and references to external sources of the domain information. 

=== Problem-solving method (PSM) ===

A computer program that is used in conjunction with a knowledge base
to answer questions or solve problems.

=== Slot ===

An attribute of a class.
For example, a ''physician class''
might have ''name'', ''title'', and ''phone number'' as slots.

=== Slot Type ===

A slot facet that identifies the kind of values a slot may have -
any, boolean, float, instance, integer, string, or symbol.

=== Slots Tab ===

The {{#var:PrF}} part that allows you
to create, view, edit, and delete slots. 

=== Symbol ===

An enumerated list of slot values,
such as red, blue, green.

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