Directional derivative in content MathML?

Is there an accepted notation for marking up directional (ie. vector) 
derivatives ( in 
content MathML?  My first inclination was to use the <gradient> tag, but 
that's not quite correct since it's really the dot product of the 
gradient and the unit direction vector.  Is the <diff/> tag appropriate 
here?  How would I specify the directional vector?  A <bvar> perhaps?

-- Brent


"The programmer, like the poet, works only slightly removed from pure
  thought-stuff.  He builds his castles in the air, from air, creating
  by exertion of the imagination.  Few media of creation are so
  flexible, so easy to polish and rework, so readily capable of
  realizing grand conceptual structures."
                         -- Frederick Brooks, Jr., The Mythical Man Month

Received on Monday, 19 May 2003 16:25:42 UTC