Currently the XML transformer adds for every namespaceUri an extra prefix even if it is globally defined. Which looks really ugly.

Example:

<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<definitions xmlns:camunda="http://activiti.org/bpmn" targetNamespace="http://www.omg.org/spec/BPMN/20100524/MODEL" xmlns="http://www.omg.org/spec/BPMN/20100524/MODEL">
<process id="process_4dd2fa37-cdab-4314-8ae6-5faf3b63b809">
<startEvent id="start" xmlns:ns0="http://activiti.org/bpmn" ns0:test1="hello" xmlns:ns1="http://activiti.org/bpmn" ns1:test2="world"/>
</process>
</definitions>

Althoug the camunda prefix is globally definied the transformer adds the ns0 and ns1 prefix to the start event.