Theme:
The second data field defines a data source to calculate the final value from two values, the data field(s) and this value.
If not specified differently, iXMaps will perform a 'percent' calculation.
Other calculations can be defined by 'theme type' modificators like PERMILLE, FACTOR, DIFFERENCE ...
The theme 'type' is a string with one or more key words to define the theme type
There are two basic theme types:
and different CHART types like PIE, BAR or SYMBOL and the class distributon mode like EQUIDISTANT, QUANTILE or LOGARITHMIC or CATEGORICAL for discrete value like 'type' or 'year'
('significant' is a value that is most above its own mean value; measured in standard deviation)
The range scale defines a factor to apply on yaxis compression or complex symbol radius.