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当连接某个节点的其他节点都被删除时，MPxNode根据情况决定是否删除| MStatus | setExistWithoutInConnections (bool flag) |
| This method specifies whether or not the node can exist without input connections. | |
| bool | existWithoutInConnections (MStatus *ReturnStatus=NULL) const |
| Determines whether or not this node can exist without input connections. | |
| MStatus | setExistWithoutOutConnections (bool flag) |
| This method specifies whether or not the node can exist without output connections. | |
| bool | existWithoutOutConnections (MStatus *ReturnStatus=NULL) const |
| Determines whether or not this node can exist without output connections. |
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原文地址：http://www.cnblogs.com/dydx/p/4287231.html
