Hi roxy1987, jBPM5 does not parse processes described via jPDL, but BPMN2. If you are interested in migrating your jPDL-based processes to jBPM5 I think starting off with this article: http://planet.jboss.org/post/migrating_to_jbpm5 would help.
jBPM5 does not use the signavio editor, however the jBPM Web Designer ( http://www.jboss.org/jbpm/components/designer ). We hope that the jPDL->BPMN2 migration project mentioned in the above article ( https://github.com/droolsjbpm/jbpmmigration ) will be integrated into it when it becomes stable.
Thanks.