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The IDEF1X notation for the above data model example is shown in Figure 9 following.
对以上数据模型使用IDEF 1x符号的例子如下面的图9所示。
Figure 3: an informal system drawing without well-defined modeling notation can quickly become incoherent.
图3：没有用定义明确的建模符号绘制的非正式的系统会很快松散起来。
The notation we typically use is a UML class diagram (see Figure 6 for an example).
我们通常使用的符号是UM l类关系图(有关示例，请参见图6)。
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