MarcFactory factory = MarcFactory.newInstance();
MarcReader reader = new MarcStreamReader(input);
while (reader.hasNext()) {
Record record = reader.next();
DataField field = factory.newDataField("856", '4', '2');
field.addSubfield(factory.newSubfield('3',
"Contributor biographical information"));
field.addSubfield(factory.newSubfield('u',
"http://en.wikipedia.org/wiki/Michael_Chabon"));
record.addVariableField(field);
System.out.println(record.toString());
}
}