code: void writeAuthor() throws XMLStreamException {
  
          xmlWriter.writeStartElement(ATOM_AUTHOR);
          xmlWriter.writeStartElement(ATOM_NAME);
          xmlWriter.writeCharacters(ATOM_AUTHOR_ODATA_FRAMEWORK);
          xmlWriter.writeEndElement();
          xmlWriter.writeEndElement();
      }
docs: Write an {@code <author>} element.
  
  @throws XMLStreamException If unable to write to stream