SLD — Styled Layer Descriptor
An SLD 1.0.0 document is an XML rule tree that tells any OGC server — or client — how to draw a layer: StyledLayerDescriptor → NamedLayer → UserStyle → FeatureTypeStyle → Rule → symbolizers. Rule conditions reuse the project's Filter Encoding model (OgcFilter, from ../FilterEncoding).
The object model
The classes (namespace IRI.Maptor.Core.Ogc.SLD) mirror the spec: PointSymbolizer, LineSymbolizer, PolygonSymbolizer, TextSymbolizer and RasterSymbolizer are built from Fill, Stroke, Font and Mark, each carrying its settings as a list of CssParameter values (with enums SldFontStyle, SldFontWeight, SldStrokeLineCap, SldStrokeLineJoin for the fixed vocabularies). A Rule adds the ogc:Filter condition and min/max scale denominators.
using IRI.Maptor.Core.Ogc.SLD;
var rule = sld.NamedLayers[0].UserStyles[0].FeatureTypeStyles[0].Rules[0];
// rule.Filter — the OgcFilter condition, e.g. pop > 1M
// rule.ElseFilter — marks the fallback ("otherwise") rule
// rule.MinScaleDenominator — visibility scale range (with Max…)
// rule.Symbolizers — polymorphic list: Point/Line/Polygon/Text/RasterSymbolizer
Reading and writing
SldHelper provides the entry points; parsing returns null when the XML isn't a valid SLD.
StyledLayerDescriptor? sld = SldHelper.Parse(File.ReadAllText("example.sld"));
string? xml = SldHelper.Serialize(sld, indented: true); // to a string
SldHelper.Save("example.sld", sld); // straight to a file
The namespace prefixes (sld, ogc, xlink, xsi) are emitted automatically from the declarations StyledLayerDescriptor carries, so no XmlSerializerNamespaces setup is required.