TriGEncoder class

Encoder for serializing RDF datasets to TriG syntax.

The TriG format is an extension of Turtle that supports named graphs, allowing multiple RDF graphs to be represented in a single document. This encoder implements the W3C TriG 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)
• Named graph support with GRAPH keyword and shorthand syntax

Example usage:

import 'package:locorda_rdf_core/core.dart';

final dataset = RdfDataset.fromQuads([Quad(
  const IriTerm('http://example.org/subject'),
  const IriTerm('http://example.org/predicate'),
  LiteralTerm('object')
)]);

final encoder = TriGEncoder();
final trig = encoder.convert(dataset);

See: TriG - RDF Dataset 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://.