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Yes, a call activity has the possibility to define in and out parameters.You can find an example in the source code (http://code.google.com/p/activitiinaction/) accompanying the Activiti in Action book.Best regards,
<callActivity …><br> <extensionElements><br> <activiti:smileysurprised:ut source="*" target="*"></activiti:smileysurprised:ut><br> </extensionElements><br> </callActivity>