xml去除指定节点，保留子节点操作

现有xml文件：

<?xml version="1.0" encoding="utf-8" ?>
<ShiftConfig xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
    <Ot>
        <BeforeOtRange>
            <Start>
                <DateTime xsi:nil="true" />
            </Start>
            <End>
                <DateTime xsi:nil="true" />
            </End>
            <StartPoint>0</StartPoint>
        </BeforeOtRange>
        <HolidayWorkingType>
            <Start>
                <DateTime xsi:nil="true" />
            </Start>
            <End>
                <DateTime xsi:nil="true" />
            </End>
            <StartPoint>0</StartPoint>
        </HolidayWorkingType>
        <AfterOtRange>
            <Start>
                <DateTime xsi:nil="true" />
            </Start>
            <End>
                <DateTime xsi:nil="true" />
            </End>
            <StartPoint>0</StartPoint>
        </AfterOtRange>
        <OvernightIn xsi:nil="true" />
        <OvernightOut xsi:nil="true" />
        <OvernightDayCount>0</OvernightDayCount>
        <TimeScale>0</TimeScale>
        <TimeScaleType>0</TimeScaleType>
        <IsAutoSwitchToOt>false</IsAutoSwitchToOt>
        <SwitchType>-1</SwitchType>
        <IsSwitchTypeAfter>false</IsSwitchTypeAfter>
        <IsSwitchTypeMiddle>false</IsSwitchTypeMiddle>
        <IsSwitchTypeBefore>false</IsSwitchTypeBefore>
        <EffectiveMonth>0</EffectiveMonth>
        <IsSwitchToHoliday>false</IsSwitchToHoliday>
        <Boundary xsi:nil="true" />
    </Ot>
    <Item>
        <IsHolidayWorkingType>false</IsHolidayWorkingType>
        <ClockInInterval xsi:nil="true" />
        <WorkingHoursType>0</WorkingHoursType>
        <WorkingHours>1900-01-01T00:00:00</WorkingHours>
        <EffectiveWorkingHours>1900-01-01T00:00:00</EffectiveWorkingHours>
        <WorkingDays>0</WorkingDays>
        <IsNoAbsence>false</IsNoAbsence>
        <LatePoint>0</LatePoint>
        <LateBoundary xsi:nil="true" />
        <LeaveEarlyPoint>0</LeaveEarlyPoint>
        <LeaveEarlyBoundary xsi:nil="true" />
        <WorkingHoursTimeScale>0</WorkingHoursTimeScale>
        <MealMinuteCount>0</MealMinuteCount>
        <SecondDayWorkingLazy xsi:nil="true" />
        <MorningHalfDayStartDate>1900-01-01T00:00:00</MorningHalfDayStartDate>
        <MorningHalfDayEndDate>1900-01-01T00:00:00</MorningHalfDayEndDate>
        <AfterHalfDayStartDate>1900-01-01T00:00:00</AfterHalfDayStartDate>
        <AfterHalfDayEndDate>1900-01-01T00:00:00</AfterHalfDayEndDate>
        <LateAsAbsenteeismDate xsi:nil="true" />
        <LeaveEarlyAsAbsenteeismDate xsi:nil="true" />
        <IsLackSwingCard>false</IsLackSwingCard>
        <DaysOfLackSwingCardAsabsenteeism>0</DaysOfLackSwingCardAsabsenteeism>
        <Priority>0</Priority>
        <IsToLateOrEarlyFromHalfDayOfAbsence>false</IsToLateOrEarlyFromHalfDayOfAbsence>
        <YesterdayStart>1900-01-01T00:00:00+08:00</YesterdayStart>
    </Item>
</ShiftConfig>

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