As a relation defines only correspondence relationships between elements, the context in which it is executed (in other words, the actual parameters that are input) is very important.
由于关联只定义元素间的通讯关系，它执行的上下文(换句话说，输入的实际参数)就十分重要了。
First of all, the relation between the domain and external elements will be analyzed, such as the operating environment and the data requirement.
首先，在领域和外部的元素之间的关系将会被分析，像是操作环境和数据需求。
Finally it adopts attributed relational graph to represent wire lines in drawing and extract connection relation between electrical elements.
用属性关系图表示原理图中的电路线，提取元件间的连接关系。
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