ELK (https://code.google.com/p/elk-reasoner/) is a reasoner aimed at supporting the OWL EL profile.
Cannot be directly used in Android projects.
The Log4j library imported by the reasoner is not supported on Android and has to be replaced by the SLF4J library (http://www.slf4j.org). For that, we used the log4j-over-slf4j (http://www.slf4j.org/legacy.html) library.