Most mechanical storage systems are simple, composed either of a single sequence of stored objects (like a bookshelf) or a series of sequences, one level deep (like a file cabinet).
大多数机械存储系统是简单的，不是由简单的存储对象序列(诸如书架)组成的。即使是一系列的序列，深度只有一层(好比文件柜)。
It has two level contents, which are the data storage model of the single IC card and the uniform data store model of any IC card.
IC卡数据存储模型存在两个层次上的内容，首先是单张IC卡的数据存储模型，该模型可以以软件的方式描述同一种型号的多张IC卡；
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