grammar

var (
	Document = op.Capture{
		Name: "Document",
		Value: op.ZeroOrMore{Value: op.And{
			op.Optional{Value: op.Or{Triple, nt.Comment}},
			nt.OWhitespace, op.EndOfLine{},
		}},
	}
	Triple = op.Capture{
		Name: "Triple",
		Value: op.And{
			nt.OWhitespace,
			Subject, nt.OWhitespace,
			nt.Predicate, nt.OWhitespace,
			Object, nt.OWhitespace,
			'.', op.Optional{Value: nt.Comment},
		},
	}
	Subject = op.Capture{
		Name:  "Subject",
		Value: op.Or{nt.IRIReference, nt.BlankNodeLabel, QuotedTriple},
	}
	Object = op.Capture{
		Name:  "Object",
		Value: op.Or{nt.IRIReference, nt.BlankNodeLabel, nt.Literal, QuotedTriple},
	}
	QuotedTriple = op.Capture{
		Name: "QuotedTriple",
		Value: op.And{
			"<<",
			nt.OWhitespace,
			op.Reference{Name: "Subject"}, nt.OWhitespace,
			nt.Predicate, nt.OWhitespace,
			op.Reference{Name: "Object"}, nt.OWhitespace,
			">>",
		},
	}
)