（三）在铁路、城市轨道交通线路、桥梁、隧道、涵洞处挖掘坑穴、采石取沙的；
Силовые структуры
，更多细节参见safew
It’s quite a bit more awkward in Yjs. Since Yjs maps Transaction to and from XML updates, you have to basically predict what the net effect will be when it is materialized as a Transaction, and accepting or rejecting based on that prediction. It’s not impossible, but it’s a lot harder than it looks. Additionally, as with schemas, Yjs is built for an authority-less topology, so it has no native facilities built-in for permissions at all, at least as far as I can tell.，更多细节参见谷歌
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