[mapserver-users] how to define the CLASSITEM and EXPRESSION in this case?

[jjwang]

I want to define classes according to the proportion between two attributes
of the feature.
How to do this?
For example: feature has two attributes 'PopulationOver65' and
'PopulationTotal'. They are both numbers.
I want the color of this feature:
green if PopulationOver65/PopulationTotal <10%,
yellow if 10% -30%,
red if 30%.

Anyway to do this?

JJ

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