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