EL++ is a lightweight description logic that was designed to

• capture the expressive power that is used by large-scale ontologies from practical applications
• have polytime reasoning problems, in particular classification and instance checking

_{(www.w3.org 2010)}

EL++ has been incorporated into OWL 2 as a OWL 2 EL Profile.

References

• Franz Baader, Sebastian Brandt, Carsten Lutz: Pushing the EL Envelope. IJCAI 2005: 364-369