Texture Coordinate struct

Hi,

  I am doing some background development/design of data structures
which will eventually holds geometry which I will view interactively
(OpenGL) and ex****ted for rendering (RenderMan)

  I currently have the usual Point and Vector struct/class, I am
contemplating introducing a TextureCoordinate struct/class but can't
think of operations (methods) which are unique to texture coordinate
which are not handle by vector.

  Component wise, I will have 4 components so I can represent s,t,r
and q for OpenGL.

  Any comments or suggestions?

Regards