Add a new mechanism in mapfish print call to add arbitary data maps Data properties are identified by starting with mapfish-data and they are then split in info value pairs where info can be the description of the information and value the value of the information to be transported in the data map.

package de.intevation.flys.artifacts.math;

public final class Sub
implements         Function
{
    private double s;

    public Sub(double s) {
        this.s = s;
    }

    @Override
    public double value(double x) {
        return x - s;
    }
}
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