This book constitutes the refereed proceedings of the 9th International RuleML Symposium
RuleML 2015 held in Berlin Germany in August 2015.The 25 full papers 4 short papers 2 full
keynote papers 2 invited research track overview papers 1 invited paper 1 invited abstracts
presented were carefully reviewed and selected from 63 submissions. The papers cover the
following topics: general RuleML track complex event processing track existential rules and
datalog+ - track legal rules and reasoning track rule learning track industry track.
