Contents
● Using this Guide
● What is Protégé-2000?
● Planning a Protégé-2000 Project
● A Newspaper Example
● Projects
● Classes
● Slots
● Forms
● Instances
● Queries
● RDF Support
● Extending Protégé-2000
● Glossary
For problems or questions, contact:
protege-discussion@lists.stanford.edu
For the latest implementation, see:
http://protege.stanford.edu
What is Protégé-2000?
Protégé-2000 is an integrated software tool used by system developers and domain experts to
develop
knowledge-based systems. Applications developed with Protégé-2000 are used in
problem-solving and decision-making in a particular
domain.
While our earlier Protégé/Win, like a classical database system, separately defined classes of
information (schema) and stored instances of these classes, Protégé-2000 makes it easier to
work simultaneously with both classes and instances. Thus, a singular instance can be used on
the level of a class definition, and a class can be stored as an instance. Similarly, slots, which
earlier were employed only within classes, are now elevated to the same level as classes. With
this new knowledge model we also facilitate conformance to the
Open Knowledge Base
Connectivity (OKBC) protocol for accessing knowledge bases stored in knowledge
representation systems. Finally, applications on top of these components are also executed
within the integrated Protégé-2000 environment.
The Protégé-2000 tool accesses all of these parts through a uniform GUI (graphical user
interface) whose top-level consists of overlapping tabs for compact presentation of the parts and
for convenient co-editing between them. This "tabbed" top-level design permits an integration
of (1) the modeling of an ontology of classes describing a particular subject, (2) the creation of
a
knowledge-acquisition tool for collecting knowledge, (3) the entering of specific instances of
data and creation of a
knowledge base, and (4) the execution of applications. The ontology
defines the set of concepts and their relationships. The knowledge-acquisition tool is designed
to be domain-specific, allowing domain experts to easily and naturally enter their knowledge of
the area. The resulting knowledge base can then be used with a
problem-solving method to
answer questions and solve problems regarding the domain. Finally, an
application is the end
product created when the knowledge base is used in solving an end-user problem employing
appropriate problem-solving, expert-system, or decision-support methods.
The main assumption of Protégé-2000 is that knowledge-based systems are usually very
expensive to build and maintain. For example, the expectation is that knowledge-based system
development is a team effort, including both developers and domain experts who may have less
familiarity with computer software. Protégé-2000 is designed to guide developers and domain
experts through the process of system development. Protégé-2000 is designed to allow
developers to reuse domain ontologies and problem-solving methods, thereby shortening the
time needed for development and program maintenance. Several applications can use the same
domain ontology to solve different problems, and the same problem-solving method can be
used with different ontologies. For more information about building knowledge-based systems
and the Protégé-2000 approach, see
Planning a Protégé-2000 Project.
Protégé-2000 is currently being used in clinical medicine and the biomedical sciences, although
it can be used in any field where the concepts can be modeled as a class hierarchy. Throughout
this online guide, you will see examples of a newspaper domain used to illustrate points of
explanation; for more information about this running example, see an overview of the
Newspaper Example.
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