I struggled with this too on v5.6. After a recent post, I found this link:
http://mapserver.org/development/rfc/ms-rfc-6.html
It shows how COLORRANGE, DATARANGE, and RANGEITEM can be used to apply a gradient. It works OK on 5.6.

I still don't know what RANGEITEM does.

kind regards,
Sam Skinner
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