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According to the tutorials:
http://wiki.ros.org/urdf/Tutorials/Using%20Xacro%20to%20Clean%20Up%20a%20URDF%20File
xacro complains when some xacro components specify the URL
as http://www.ros.org/wiki/xacro and others
as http://ros.org/wiki/xacro.
This is a small follow-up to #269.