既然这是我基于UML 2的uml图系列文章的第一篇，我们需要首先讨论对UML 2图符号的一个补充，即一个叫做框架的符号元件。
Since this is the first article in my UML diagram series that is based on UML 2, we need to first discuss an addition to the notation in UML 2 diagrams, namely a notation element called a frame.
剩下的那些非基本符号作为补充可使逻辑系统能够更简洁明了。
The remaining symbols, not basic, are more comprehensive and enable logic systems to be diagrammed more concisely.
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