Magnetic moment of current loop integral

[ognik]

The question states: The calculation of the magnetic moment of a current loop leads to the line integral
∮ r x dr
I am puzzled - shouldn't this be ∮ r x dl where r is the radius of the loop and dl is the small change along the loop?
(I think dr would be in the same direction as r, so no cross product for r and dr?)

 

[mfb]

That looks like a notation error. r x dl looks better.