text: #ifndef BOOST_ARCHIVE_XML_ARCHIVE_EXCEPTION_HPP
  #define BOOST_ARCHIVE_XML_ARCHIVE_EXCEPTION_HPP
  
  // MS compatible compilers support #pragma once
  #if defined(_MSC_VER) && (_MSC_VER >= 1020)
  # pragma once
  #endif
  
  /////////1/////////2/////////3/////////4/////////5/////////6/////////7/////////8
  // xml_archive_exception.hpp:
  
  // (C) Copyright 2007 Robert Ramey - http://www.rrsd.com . 
  // Use, modification and distribution is subject to the Boost Software
  // License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
  // http://www.boost.org/LICENSE_1_0.txt)
  
  //  See http://www.boost.org for updates, documentation, and revision history.
  
  #include <exception>
  #include <cassert>
  
  #include <boost/archive/archive_exception.hpp>
  
  namespace boost {
  namespace archive {
  
  //////////////////////////////////////////////////////////////////////
  // exceptions thrown by xml archives
  //
  class xml_archive_exception : 
      public virtual archive_exception
  {
  public:
      typedef enum {
          xml_archive_parsing_error,    // see save_register
          xml_archive_tag_mismatch,
          xml_archive_tag_name_error
      } exception_code;
      exception_code code;
      xml_archive_exception(exception_code)
      {}
      virtual const char *what( ) const throw( )
      {
          const char *msg;
          switch(code){
          case xml_archive_parsing_error:
              msg = "unrecognized XML syntax";
              break;
          case xml_archive_tag_mismatch:
              msg = "XML start/end tag mismatch";
              break;
          case xml_archive_tag_name_error:
              msg = "Invalid XML tag name";
              break;
          default:
              msg = archive_exception::what();
              break;
          }
          return msg;
      }
  };
  
  }// namespace archive
  }// namespace boost
  
  #endif //BOOST_XML_ARCHIVE_ARCHIVE_EXCEPTION_HPP
  