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{{Paper
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|title=None
|pdfUrl=https://ceur-ws.org/Vol-1417/preface.pdf
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<pdf width="1500px">https://ceur-ws.org/Vol-1417/preface.pdf</pdf>
<pre>
The 9th International Web Rule Challenge at the 9th International Web Rule Symposium (RuleML 2015)
in Berlin is a forum where new ways of using rule-based systems are presented and practical
experiences about implementing these systems are reported. The 9th edition features a broad set of
rule-based applications: toolkits for querying existential rule knowledge bases, UIs for rule modelling
and rule editors, rule translators, agent-based systems as well as the RuleML 1.02 family of rule
markup languages.

As in the past four editions, the RuleML Symposium hosts the 5th Doctoral Consortium attracting Ph.D.
researchers in the area of Web Rules from different backgrounds and encouraging an interdisciplinary
research approach. This year there are five PhD papers introducing research into data specification and
extraction, software bridges between Prolog and general Java development, rule induction techniques
and integration between business processes and business rules. The doctoral students benefit from the
dynamic and friendly setting at RuleML, as well as from fruitful interactions with their dedicated
academic mentors and the attending researchers and industrial experts in the field, who can evaluate
their research projects from both theoretical and practical perspectives.

Following the previous successful RuleML2014 track on “Learning business Rules from Data”, this year
the RuleML Challenge features “Rule-based recommender systems for the web of data” Challenge
(RecSysRules’15). The aim of the challenge was to evaluate performance of rule learning algorithms
applied on recommender problems and to track progress in the use of linked open data cloud for
feature set extension in machine learning. There were three participating teams in the RecSysRules
challenge and 37 submitted runs. Short papers describing two of the participating systems are
included in the proceedings, along with a paper describing framework that can be used to create
datasets for future editions of the challenge.

A highlight of this year's event is the Industry Track introducing three papers describing research work
in innovative companies, from rule-based applications in financial industry to systems that can
generate large quantity of natural language text in different languages, as well as management
applications for agricultural policies data.

The work submitted by Jean-François Baget, Alain Gutierrez, Michel Leclère, Marie-Laure Mugnier,
Swan Rocher and Clément Sipieter entitled “ Datalog+, RuleML and OWL 2: Formats and Translations
for Existential Rules” has been awarded with the RuleML2015 Challenge Best Paper Award.

The KTIML team submission to the RecSysRules’15 challenge entitled "Transformation and aggregation
preprocessing for top-k recommendation GAP rules induction" has been awarded prize for the best
recommender performance.

Thanks to all authors, students, supervisors, referees, co-chairs, members of the program committee
and the organizing team that made the RuleML2015 Symposium, 9th International Web Rule
Challenge, and 5th Doctoral Consortium great successes.



August 2015

Nick Bassiliades, Paul Fodor, Adrian Giurca, Georg Gottlob, Tomas Kliegr, Grzegorz J. Nalepa, Monica
Palmirani, Adrian Paschke, Mark Proctor, Dumitru Roman, Fariba Sadri, Nenad Stojanovic.
Proceedings Editors

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