Yes, documentation of the existing system and documentation of prospective future changes should be separate.
The most important documentation is what the current system is, and what it does. Prospective changes don't provide anything of value from a maintenance perspective - just clutter. Prospective changes may be determined to be of lesser importance depending on various factors (most likely being money to fund), and timelines are adjusted accordingly.
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是的，现有系统的文档和未来预期变更的文档应该分开。
最重要的文档是当前系统是什么及其用途。从维护的角度来看，预期的变化不会提供任何有价值的东西——只是混乱。根据各种因素（最有可能是资金资助），预期的变化可能被确定为不太重要，并且时间表也会相应调整。
Yes, documentation of the existing system and documentation of prospective future changes should be separate.
The most important documentation is what the current system is, and what it does. Prospective changes don't provide anything of value from a maintenance perspective - just clutter. Prospective changes may be determined to be of lesser importance depending on various factors (most likely being money to fund), and timelines are adjusted accordingly.