SymbologySupport.md

+# Symbology Support
+
+Also see [[XMLConfigReference]] for descriptions of these elements within the xml mapfile.
+
+## Styles
+
+Named styles, each layer can reference 0...N styles.
+
+Order is important -- as in the 'painter model' or [Painter's algorithm](http://en.wikipedia.org/wiki/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.
+
+## Rules
+
+Each style can have 0...N rules. Rules can have min/max scale denominators <someone explain min/max denom here!> and filter expressions.
+
+## Filters
+
+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
+
+Symbolizers describe how features appear on a map.
+
+ * [[BuildingSymbolizer]]
+ * [[GlyphSymbolizer]] (deprecated)
+ * [[GroupSymbolizer]]
+ * [[LineSymbolizer]]
+ * [[LinePatternSymbolizer]]
+ * [[MarkersSymbolizer]]
+ * [[PolygonSymbolizer]]
+ * [[PolygonPatternSymbolizer]]
+ * [[PointSymbolizer]]
+ * [[RasterSymbolizer]]
+ * [[ShieldSymbolizer]]
+ * [[TextSymbolizer]]
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