public IEnumerable <Edge> Triples()
{
var stream = new Antlr4.Runtime.AntlrInputStream(_reader);
var lexer = new NQuadsLexer(stream);
var parser = new NQuadsParser(new Antlr4.Runtime.CommonTokenStream(lexer));
foreach (var child in parser.nquadsDoc().statement())
{
yield return(null);
}
}
