However: Ontologies are Hard!
- A full ontology-based application is a very complex system
- Hard to implement, may be heavy to run…
- … and not all applications may need it!
- Three layers of OWL are defined: Lite, DL, and Full
- decreasing level of complexity and expressiveness
- “Full” is the whole thing
- “DL (Description Logic)” restricts Full in some respects
- “Lite” restricts DL even more
- decreasing level of complexity and expressiveness