In truth, their success stems from a combination of factors: They both raise the level of abstraction and automate the transformation of information representation from higher to lower levels.
实际上，它们的成功源于一些因素的组合：它们都提高了抽象层次，并且将从较高到较低层次的信息表示的转换自动化。
As a DMS always returns the information in the same format (a data Graph), it hides the actual data storage and provides a level of abstraction between the SDO application and the EIS.
DMS总是以同一种格式(数据图)返回信息，它隐藏了实际的数据存储信息，在SDO应用程序和EIS之间提供了一层数据提取的功能。
Related to abstraction, the idea of leveling is to place information items into peer categories at the correct level in the hierarchy.
与抽象相关，校平的概念是将信息项放在层次结构中正确级别的对等分类中。
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