flutter_map_sld

Parse, validate, and use OGC Styled Layer Descriptor (SLD) and Symbology Encoding (SE) styles in Dart.

Raster-first, pure Dart, no Flutter dependency.

Features

• Parse SLD/SE XML from string or bytes
• SLD 1.0 and SE/SLD 1.1 namespace variants (sld:, se:, unprefixed)
• Immutable domain model with deep equality
• Separate parse and validation results
• 7 validation rules (opacity, ColorMap, quantity ordering, vendor extensions)
• Legend and color scale extraction
• Unknown/vendor XML elements preserved as ExtensionNode

Usage

import 'package:flutter_map_sld/flutter_map_sld.dart';

// Parse
final result = SldDocument.parseXmlString(sldXml);
if (result.hasErrors) {
  for (final issue in result.issues) {
    print('${issue.severity.name}: ${issue.message}');
  }
  return;
}
final sld = result.document!;

// Validate
final validation = const SldValidator().validate(sld);

// Extract raster styles
final rasterSymbolizers = sld.selectRasterSymbolizers();
final colorMap = rasterSymbolizers.first.colorMap!;

// Legend and color scale
final legend = extractLegend(colorMap);
final scale = extractColorScale(colorMap);

See example/parse_and_validate.dart for a complete example.

Part of a package family

Package	Description
flutter_map_sld (this)	Pure Dart core
flutter_map_sld_io	File and HTTP helpers
flutter_map_sld_flutter_map	Flutter and flutter_map adapters

Documentation

• Concept — Product vision, scope, and target audience
• Architecture — Layer model, domain model, and test strategy

License

MIT — see LICENSE.

Libraries

flutter_map_sld

Parse, validate, and use OGC Styled Layer Descriptor (SLD) and Symbology Encoding (SE) styles in Dart.