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  //sanitize keys since an unvalid xml name will make the project file unreadable !

  QStringList sanitizedKeyTokens = QStringList();

  for (int i = 0; i < keyTokens.size(); ++i){

    QString sanitizedKey = keyTokens.at(i);

    //replace invalid chars

    //TODO : this is too exclusive, this should be the regexp, but I don't manage to make it work : http://www.w3.org/TR/REC-xml/#NT-NameChar

    //QString nameCharRegexp = QString( "[^:_A-Z_a-z0-9\\xC0-\\xD6\\xC0-\\xD6\\xF8-\\x2FF\\x370-\\x37D\\x37F-\\x1FFF\\x200C-\\x200D\\x2070-\\x218F\\x2C00-\\x2FEF\\x3001-\\xD7FF\\xF900-\\xFDCF\\xFDF0-\\xFFFD\\x10000-\\xEFFFF\\-\\.0-9\\xB7\\x0300-\\x036F\\x203F-\\x2040]" );

    QString nameCharRegexp = QString( "[^:_A-Za-z0-9]" );

    sanitizedKey = sanitizedKey.replace( QRegExp(nameCharRegexp) , "_" );

    //prepend "_" if startchar is invalid

    //TODO : this is too exclusive, this should be the regexp, but I don't manage to make it work : http://www.w3.org/TR/REC-xml/#NT-NameStartChar

    //QString nameStartCharRegexp = QString( "^[^:_A-Z_a-z0-9\\xC0-\\xD6\\xC0-\\xD6\\xF8-\\x2FF\\x370-\\x37D\\x37F-\\x1FFF\\x200C-\\x200D\\x2070-\\x218F\\x2C00-\\x2FEF\\x3001-\\xD7FF\\xF900-\\xFDCF\\xFDF0-\\xFFFD\\x10000-\\xEFFFF]" );

    QString nameStartCharRegexp = QString( "^[^:_A-Za-z]" );

    if( sanitizedKey.contains( QRegExp(nameStartCharRegexp) ) ){

      sanitizedKey = '_' + sanitizedKey;

    }

    sanitizedKeyTokens.append(sanitizedKey);

  }

  return sanitizedKeyTokens;