The selection for the capsule must include at least one input and no more than one output . nodes that are not directly linked to each other and group nodes cannot be encapsulated . note that an operator used as a secondary input is considered as an output 为胶囊选择必须包含最少一个导入并且不超过一个输出.节点不能立即被连接到各自其它的并且群组节点不能被形成胶囊.注释一操作被用作二级导入被认为是输出
