@Override
            public void visitSos(final int marker, final byte[] markerBytes, final byte[] imageData) {
                // don't need image data
            }
Extracts embedded XML metadata as XML string.
<p>

@param byteSource File containing image data.
@param params     Map of optional parameters, defined in ImagingConstants.
@return Xmp Xml as String, if present. Otherwise, returns null.
src/main/java/org/apache/commons/imaging/formats/jpeg/JpegImageParser.java