String  *LiteralString `parser:" | @LitString"`
	Boolean *Boolean       `parser:" | @(\"TRUE\" | \"FALSE\")"`
	Null    bool           `parser:" | @\"NULL\""`
	Missing bool           `parser:" | @\"MISSING\")"`
}

// Identifier represents a parsed identifier
type Identifier struct {
	Unquoted *string           `parser:"  @Ident"`
	Quoted   *QuotedIdentifier `parser:"| @QuotIdent"`
}