re-using raster CLASS definitions

[Jeff de La Beaujardiere]

Is there a way to re-use raster class definitions in a mapfile? I have several 
shapefiles with a large number of polygon types mapped to different colors. The 
same types appear in all the files. At present I duplicate all the CLASS entries 
in each LAYER, but I would like to shorten the mapfile by collecting them 
somewhere. All the layers are in the same GROUP, if that helps.

Thanks,
Jeff DLB