Conceptual graphs (CGs) are a system of logic based
on the existential graphs
Charles Sanders Peirce
and the semantic networks of artificial intelligence.
They express meaning in a form that is
logically precise, humanly readable, and computationally tractable.
With a direct mapping to language, conceptual graphs serve as an
intermediate language for translating computer-oriented formalisms to
and from natural languages. With their graphic representation, they
serve as a readable, but formal design and specification language.
CGs have been implemented in a variety of projects for information
retrieval, database design, expert systems, and natural language
For examples of conceptual graphs and their translations to predicate
calculus and the Knowledge Interchange Format (KIF):
Examples using the standard HTML 4.0 symbol definitions
Examples using the symbols font in MS Windows
(suitable for older versions of Navigator or Internet Explorer).
For the conceptual graph standard:
Working draft of the proposed ISO standard
For a bibliography of books and conference proceedings about
For links to other information about conceptual graphs, including
conferences and tools:
CG home page at the University of Alabama at Hunstville
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