8. 擴(kuò)展

以rpc開頭的方法名預(yù)留作為系統(tǒng)擴(kuò)展，且必須不能用于其他地方。每個系統(tǒng)擴(kuò)展都應(yīng)該有相關(guān)規(guī)范文檔，所有系統(tǒng)擴(kuò)展都應(yīng)是可選的。

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