Details
Description
Only prefix custom attributes on BPMN2.0 elements (eg. activiti:assignee) and custom activiti elements (eg. activiti:listener). The attributes of custom elements (eg. <activiti:listener class="org...." />) will not use namespace prefix, since the attribute is unique in the parent element (and namespace), there is no need to add those attributes to the activiti: namespace.
Also check if all example xml's contain the namespace definition for activiti, even if no activiti tags are used.