* @return the interpolated value
         */
        String transform(String source, String fieldName);
    }

    @Nonnull
    static XmlReaderRequestBuilder builder() {
        return new XmlReaderRequestBuilder();
    }

    @NotThreadSafe
    class XmlReaderRequestBuilder {
        Path path;
        Path rootDirectory;
        URL url;
        InputStream inputStream;
        Reader reader;