// Make subtype to avoid recursive UnmarshalXML().
	type subReaderArgs ReaderArgs
	parsedArgs := subReaderArgs{}
	if err := d.DecodeElement(&parsedArgs, &start); err != nil {
		return err
	}

	parsedArgs.ContentType = strings.ToLower(parsedArgs.ContentType)
	switch parsedArgs.ContentType {
	case document, lines:
	default:

		// Read tokens from the XML document in a stream.
		t, err := d.Token()
		if err != nil {
			if err == io.EOF {
				break
			}
			return err
		}

		if se, ok := t.(xml.StartElement); ok {
			tagName := se.Name.Local
			switch tagName {
			case "AllowQuotedRecordDelimiter":
				var b bool
				if err = d.DecodeElement(&b, &se); err != nil {
					return err
				}
				args.AllowQuotedRecordDelimiter = b
			default:

	// Make subtype to avoid recursive UnmarshalXML().
	type subReaderArgs ReaderArgs
	parsedArgs := subReaderArgs{}
	if err := d.DecodeElement(&parsedArgs, &start); err != nil {
		return err
	}

	args.unmarshaled = true
	return nil