However: Ontologies are Hard!
A full ontology-based application is a very complex system
in fact, it is turning mathematical logic into a program
Hard to implement, heavy to run…
… and not all applications may need it!
Three layers of OWL are defined: Lite, DL, and Full
increasing level of complexity and expressiveness
“Full” is the whole thing
“DL (Description Logic)” restricts Full in some respects
“Lite” restricts DL even more
Ivan Herman
, W3C Head of Offices
© 1994-2004, W3C (MIT,ERCIM,Keio)
Edinburgh, 7 April, 2004
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