'Generate org.activiti.bpmn.model.Classes from .bpmn.xml or .bpmn files?

i am new to activiti and i am currently trying to learn more about the engine. After debugging our application i found classes like "BpmnParse", "BpmnXMLConverter", "BpmnModel" etc.

What i am trying to find is a way to convert our .bpmn or bpmn20.xml into this "BpmnModel". Then I would like to work with these classes and later on convert them back into an xml file.

The converting of the bpmn.xml into bpmnModel is used, when I am deploying a process. Internally the line seems to prove that the functionality exists in one way at least:

bpmnModel = converter.convertToBpmnModel(streamSource, validateSchema, enableSafeBpmnXml, encoding);  (org.activiti.engine.impl.bpmn.parser;)

In the package "org.activiti.bpmn.converter I found:

public byte[] convertToXML(BpmnModel model) {
   return convertToXML(model, DEFAULT_ENCODING);
}

So it seems like it should be possible. However, how can i extract for example the UserTask form this model and maybe set properties. And can i really convert the model back into valid XML programmatically?

Thank you very much in advance.

activiti


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