TurtleEncoder class

Encoder for serializing RDF graphs to Turtle syntax.

The Turtle format (Terse RDF Triple Language) is a textual syntax for RDF that allows writing down RDF graphs in a compact and natural text form. This encoder implements the W3C Turtle recommendation, with additional optimizations for readability and compactness.

Features:

• Automatic namespace prefix generation
• Compact representation for blank nodes and collections
• Proper indentation and formatting for readability
• Support for base URI relative references
• Special handling for common datatypes (integers, decimals, booleans)

Example usage:

import 'package:rdf_core/rdf_core.dart';

final graph = RdfGraph();
graph.add(Triple(
  IriTerm('http://example.org/subject'),
  IriTerm('http://example.org/predicate'),
  LiteralTerm('object')
));

final encoder = TurtleEncoder();
final turtle = encoder.convert(graph);
// Outputs: @prefix ex: <http://example.org/> .
//
// ex:subject ex:predicate "object" .

See: Turtle - Terse RDF Triple Language

NOTE: Always use canonical RDF vocabularies (e.g., http://xmlns.com/foaf/0.1/) with http://, not https:// This encoder will warn if it detects use of https:// for a namespace that is canonical as http://.