code: @Nonnull
    public final XMLWriterSettings setSerializeDocType (@Nonnull final EXMLSerializeDocType eSerializeDocType)
    {
      m_eSerializeDocType = ValueEnforcer.notNull (eSerializeDocType, "SerializeDocType");
      return this;
    }
docs: Set the way how to handle the doc type.
  
  @param eSerializeDocType
  Doc type handling. May not be <code>null</code>.
  @return this