what is xmlns tag for xacro?
Here is the tutorial of [xacro](http://wiki.ros.org/urdf/Tutorials/Using%20Xacro%20to%20Clean%20Up%20a%20URDF%20File)
It is confusing for me to see the below code
Why linking to those paths?
When should I use this?
How should I write this?
I need a detailed explanation to it. I do not know what xmlns value I should assign to.
Thanks
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