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。
The data format (model) of the data graph can be considered a contract between the DMS and the client.
可以将数据图的数据格式(模型)看作DMS与客户机之间的抽象。
To keep things interesting as I explain the basics of using Xerces-C + +, I'm going to create a simple bar graph using XML as the data format.
为了在解释有关使用Xerces - C+ +的基本内容时能够有趣一些，我将用XML作为数据格式创建一个简单条形图。
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