hello everyone, I dont understand some part of necessary URDF files. With the installing of ROS/ Indigo there are thre package have already built that are urdf , urdfparserplugin and urdf_tutorial on opt/ros/indigo/share path But with the URDF tutorials there sayin command in terminal:

sudo apt-get install liburdfdom-tools

and first question is ; is that necessary to start some .setup.bash after the command upward code and install ? As you know and I read from answers this lifurdfdom-tools not belong to ROS it is belong to Ubuntu

and the second question is that I have read from community that liburdfdom-tools and urdf & urdfparserplugin against eachother and occur some error when all of them exist in system.. So i have read that I have to delete one of them , is it true ?

and the third question is that I am using ROS/ Indigo and there is no urdfdom package , should i install it ? or urdf and urdfparserplugin are the new version of this package for INDIGO ?

and where i sudo apt-get install it ? and while in which directory on terminal ? and then which setup.bash I should run ?