Similar to the previous modeling approaches, BPMN distinguishes tasks and subprocesses in the diagram, the latter being indicated by a ’+’ symbol in the rounded-corner rectangle.
与上面的建模方法类似，BPMN 在关系图中也区分任务 和子流程，且后者由圆角矩形中的“+”符号表示。
Chapter two presents the basic principle and method of product information modeling based on symbol.
第二章提出了基于符号的产品信息建模基本原理和方法。
On applying symbol modeling principle to product conceptual design, the limit of geometry expression is avoided, and the innovation and abstract requirement of product concept modeling is fulfilled.
将符号建模原理应用于产品概念设计，脱离了几何表达的束缚，满足了概念方案建模的创新性和抽象性要求。
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