Just as improvement:
I just found that Eclipse designer allows me to produce invalid Bpmn XML file, causing the error
org.activiti.bpmn.exceptions.XMLException: cvc-id.2: Há várias ocorrências do valor do ID 'xyz'.
The error is that it allows me to have a "service task" with ID "xyz" and a "process" with ID "xyz", causing error at deployment.
Would be nice if designer enforces that all ID are unique in one XML.
Regards,
Edson Richter