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If router has no parameters,

       <router router_id="2" description="quickest">                                                            
                        <parameters>                                                                                     
                                <navigation_lines file="routing_obst.xml" />                                             
                        </parameters>                                                                                    
        </router>     

than one should uncomment the navigation_lines-tag. Intuitively, I would say a user will uncomment the parameters-tag.

That leads to problems in parsing. For example in GlobalRouter.cpp this line should not assume the existence of the parameters-tag

if (e->FirstChild("parameters")->FirstChildElement("navigation_lines"))