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SymbologySupport
Also see XMLConfigReference for descriptions of these elements within the xml mapfile.
Named styles, each layer can reference 0...N styles.
Order is important -- as in the 'painter model' or Painter's algorithm to be specific. Layers that are declared first in your XML file, or added programmatically through Layer::add_style are drawn first. Layers that are declared or added later are drawn last.
Each style can have 0...N rules. Rules can have min/max scale denominators <someone explain min/max denom here!> and filter expressions.
Syntax for filter expressions is very simple, you enclose variables (evaluated at runtime) in square brackets: [attribute_name].
Support for:
- Arithmetic:
+,-,*,/ - Comparison:
>,<,=,<>,>=,<= - Logical operators:
and,or,not - Regular expression matching:
[attribute_name].match('reg_ex')
See Filter for more details (especially regarding how this is different for XML).
Symbolizers describe how features appear on a map.