Not sure about the official plugin.
Here are a few of links you might find useful
http://passion.forco.de/content/maven-drools-plugin
http://www.javaforge.com/project/DroolsHelp
http://www.javaforge.com/displayDocument/user-guide.pdf?doc_id=76238
http://www.javaforge.com/project/DroolsHelphttp://grepcode.com/snapshot/repo1.maven.org/maven2/org.boretti.drools.integration/drools5-integration-helper-maven-plugin/1.1.0
https://confluence.sakaiproject.org/display/KERNDOC/Drools+Maven+Compiler+Plugin?
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