DL derives its descriptive power from the
Figure 3. E-business process universe of discourse for an intelligent, infomediarybased,
e-marketplace
Business
Enterprise Agent Activity Resource
Is Represented By Performs
Represents Is Performed By Coordinates
HasCoordination
Owns a
D'Aubeterre, S ngh, and Iyer
Copyright ?© 2007, Idea Group Inc. Copying or distributing in print or electronic forms without written permission
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ability to enhance the expressiveness of the atomic descriptions by building complex
descriptions of concepts using concept constructors. These terminological axioms
make statements about how concepts or roles are related to each other.
This develops a set of terminologies, comprised of definitions, which are specific
axioms that define the inclusions (??†) or the equivalence (?‰?). The increased expressive
power of the language is manifested in a range of additional constructors,
including:
??? R.C (full existential value restriction)
?¬C (atomic negation of arbitrary concept)
< n R (at-most cardinality restriction)
> n R (at-least cardinality restriction)
= n R (exact cardinality restriction)
< n R.
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