ISO 8459:2009包括书目系统之间交换或可能交换的数据元素。由于不需要标准化，未交换或不太可能交换的数据元素将被忽略。不包括由传输协议处理的数据元素，只包括与应用程序级协议相关的数据元素。 注:本国际标准的法文版不包含数据元素的同义词，这解释了两个版本之间的长度差异。

ISO 8459:2009 includes data elements that are exchanged or are potentially exchanged among bibliographic systems. Those data elements that are not exchanged or not likely to be exchanged are ignored as they do not need standardization. Data elements being handled by transport protocols are not included, only those related to application level protocols. NOTE The French version of this International Standard does not contain synonyms for the data elements which explains the difference in length between the two versions.