<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def get_description(self):
 """ Tries to get WF description from 'collabration' or 'process' or 'pariticipant' Returns str: WF description """

        paths = ['bpmn:collaboration/bpmn:participant/bpmn:documentation',
                 'bpmn:collaboration/bpmn:documentation',
                 'bpmn:process/bpmn:documentation']
        for path in paths:
            elm = self.root.find(path, NS)
            if elm is not None and elm.text:
                return elm.text