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        <link:definition>061057 - Disclosure - Risk/Return Detail Data {Elements} (SIIT INTERNATIONAL EQUITY FUND)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
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        <link:definition>061058 - Document - Risk/Return Summary {Unlabeled} (SIIT WORLD EQUITY EX-US FUND)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
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        <link:definition>061059 - Schedule - Annual Fund Operating Expenses</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
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      <link:roleType roleURI="http://www.seic.com/role/ExpenseExample_S000006765Member" id="ExpenseExample_S000006765Member">
        <link:definition>061060 - Schedule - Expense Example {Transposed}</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.seic.com/role/BarChartData_S000006765Member" id="BarChartData_S000006765Member">
        <link:definition>061061 - Schedule - Annual Total Returns</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
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      <link:roleType roleURI="http://www.seic.com/role/PerformanceTableData_S000006765Member" id="PerformanceTableData_S000006765Member">
        <link:definition>061062 - Schedule - Average Annual Total Returns {Transposed}</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
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      <link:roleType roleURI="http://www.seic.com/role/RiskReturnDetailData_S000006765Member" id="RiskReturnDetailData_S000006765Member">
        <link:definition>061063 - Disclosure - Risk/Return Detail Data {Elements} (SIIT WORLD EQUITY EX-US FUND)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
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        <link:definition>061064 - Document - Risk/Return Summary {Unlabeled} (SIIT Screened World Equity Ex-US Fund)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
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        <link:definition>061065 - Schedule - Annual Fund Operating Expenses</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
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      </link:roleType>
      <link:roleType roleURI="http://www.seic.com/role/ExpenseExample_S000019597Member" id="ExpenseExample_S000019597Member">
        <link:definition>061066 - Schedule - Expense Example {Transposed}</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.seic.com/role/BarChartData_S000019597Member" id="BarChartData_S000019597Member">
        <link:definition>061067 - Schedule - Annual Total Returns</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
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      <link:roleType roleURI="http://www.seic.com/role/PerformanceTableData_S000019597Member" id="PerformanceTableData_S000019597Member">
        <link:definition>061068 - Schedule - Average Annual Total Returns {Transposed}</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
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      <link:roleType roleURI="http://www.seic.com/role/RiskReturnDetailData_S000019597Member" id="RiskReturnDetailData_S000019597Member">
        <link:definition>061069 - Disclosure - Risk/Return Detail Data {Elements} (SIIT Screened World Equity Ex-US Fund)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
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        <link:usedOn>link:definitionLink</link:usedOn>
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      <link:roleType roleURI="http://www.seic.com/role/RiskReturn_S000014581Member" id="RiskReturn_S000014581Member">
        <link:definition>061070 - Document - Risk/Return Summary {Unlabeled} (SIIT Enhanced LIBOR Opportunities Fund)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
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      <link:roleType roleURI="http://www.seic.com/role/OperatingExpensesData_S000014581Member" id="OperatingExpensesData_S000014581Member">
        <link:definition>061071 - Schedule - Annual Fund Operating Expenses</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.seic.com/role/ExpenseExample_S000014581Member" id="ExpenseExample_S000014581Member">
        <link:definition>061072 - Schedule - Expense Example {Transposed}</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
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      <link:roleType roleURI="http://www.seic.com/role/BarChartData_S000014581Member" id="BarChartData_S000014581Member">
        <link:definition>061073 - Schedule - Annual Total Returns</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.seic.com/role/PerformanceTableData_S000014581Member" id="PerformanceTableData_S000014581Member">
        <link:definition>061074 - Schedule - Average Annual Total Returns {Transposed}</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.seic.com/role/RiskReturnDetailData_S000014581Member" id="RiskReturnDetailData_S000014581Member">
        <link:definition>061075 - Disclosure - Risk/Return Detail Data {Elements} (SIIT Enhanced LIBOR Opportunities Fund)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
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      <link:roleType roleURI="http://www.seic.com/role/RiskReturn_S000006766Member" id="RiskReturn_S000006766Member">
        <link:definition>061076 - Document - Risk/Return Summary {Unlabeled} (SIIT CORE FIXED INCOME)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
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      <link:roleType roleURI="http://www.seic.com/role/OperatingExpensesData_S000006766Member" id="OperatingExpensesData_S000006766Member">
        <link:definition>061077 - Schedule - Annual Fund Operating Expenses</link:definition>
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        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
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      <link:roleType roleURI="http://www.seic.com/role/ExpenseExample_S000006766Member" id="ExpenseExample_S000006766Member">
        <link:definition>061078 - Schedule - Expense Example {Transposed}</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
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      <link:roleType roleURI="http://www.seic.com/role/BarChartData_S000006766Member" id="BarChartData_S000006766Member">
        <link:definition>061079 - Schedule - Annual Total Returns</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.seic.com/role/PerformanceTableData_S000006766Member" id="PerformanceTableData_S000006766Member">
        <link:definition>061080 - Schedule - Average Annual Total Returns {Transposed}</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
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      <link:roleType roleURI="http://www.seic.com/role/RiskReturnDetailData_S000006766Member" id="RiskReturnDetailData_S000006766Member">
        <link:definition>061081 - Disclosure - Risk/Return Detail Data {Elements} (SIIT CORE FIXED INCOME)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
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        <link:definition>061082 - Document - Risk/Return Summary {Unlabeled} (SIIT HIGH YIELD BOND FUND)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
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        <link:definition>061083 - Schedule - Annual Fund Operating Expenses</link:definition>
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      <link:roleType roleURI="http://www.seic.com/role/ExpenseExample_S000006763Member" id="ExpenseExample_S000006763Member">
        <link:definition>061084 - Schedule - Expense Example {Transposed}</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
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      <link:roleType roleURI="http://www.seic.com/role/BarChartData_S000006763Member" id="BarChartData_S000006763Member">
        <link:definition>061085 - Schedule - Annual Total Returns</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
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      <link:roleType roleURI="http://www.seic.com/role/PerformanceTableData_S000006763Member" id="PerformanceTableData_S000006763Member">
        <link:definition>061086 - Schedule - Average Annual Total Returns {Transposed}</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
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        <link:definition>061087 - Disclosure - Risk/Return Detail Data {Elements} (SIIT HIGH YIELD BOND FUND)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
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        <link:definition>061088 - Document - Risk/Return Summary {Unlabeled} (SIIT LONG DURATION FUND)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
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        <link:definition>061089 - Schedule - Annual Fund Operating Expenses</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
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      <link:roleType roleURI="http://www.seic.com/role/ExpenseExample_S000006762Member" id="ExpenseExample_S000006762Member">
        <link:definition>061090 - Schedule - Expense Example {Transposed}</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
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      <link:roleType roleURI="http://www.seic.com/role/BarChartData_S000006762Member" id="BarChartData_S000006762Member">
        <link:definition>061091 - Schedule - Annual Total Returns</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
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      <link:roleType roleURI="http://www.seic.com/role/PerformanceTableData_S000006762Member" id="PerformanceTableData_S000006762Member">
        <link:definition>061092 - Schedule - Average Annual Total Returns {Transposed}</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
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        <link:definition>061093 - Disclosure - Risk/Return Detail Data {Elements} (SIIT LONG DURATION FUND)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
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        <link:definition>061094 - Document - Risk/Return Summary {Unlabeled} (SIIT Long Duration Corporate Bond Fund)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
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        <link:definition>061095 - Schedule - Annual Fund Operating Expenses</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
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      <link:roleType roleURI="http://www.seic.com/role/ExpenseExample_S000036875Member" id="ExpenseExample_S000036875Member">
        <link:definition>061096 - Schedule - Expense Example {Transposed}</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
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        <link:definition>061097 - Disclosure - Risk/Return Detail Data {Elements} (SIIT Long Duration Corporate Bond Fund)</link:definition>
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        <link:usedOn>link:definitionLink</link:usedOn>
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        <link:definition>061098 - Document - Risk/Return Summary {Unlabeled} (SIIT Ultra Short Duration Bond Fund)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
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        <link:definition>061099 - Schedule - Annual Fund Operating Expenses</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
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      <link:roleType roleURI="http://www.seic.com/role/ExpenseExample_S000031047Member" id="ExpenseExample_S000031047Member">
        <link:definition>061100 - Schedule - Expense Example {Transposed}</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
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        <link:definition>061101 - Disclosure - Risk/Return Detail Data {Elements} (SIIT Ultra Short Duration Bond Fund)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
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        <link:definition>061102 - Document - Risk/Return Summary {Unlabeled} (SIIT EMERGING MARKETS DEBT FUND)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
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        <link:definition>061103 - Schedule - Annual Fund Operating Expenses</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
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      <link:roleType roleURI="http://www.seic.com/role/ExpenseExample_S000006764Member" id="ExpenseExample_S000006764Member">
        <link:definition>061104 - Schedule - Expense Example {Transposed}</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
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      <link:roleType roleURI="http://www.seic.com/role/BarChartData_S000006764Member" id="BarChartData_S000006764Member">
        <link:definition>061105 - Schedule - Annual Total Returns</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
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      <link:roleType roleURI="http://www.seic.com/role/PerformanceTableData_S000006764Member" id="PerformanceTableData_S000006764Member">
        <link:definition>061106 - Schedule - Average Annual Total Returns {Transposed}</link:definition>
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        <link:definition>061107 - Disclosure - Risk/Return Detail Data {Elements} (SIIT EMERGING MARKETS DEBT FUND)</link:definition>
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        <link:definition>061108 - Document - Risk/Return Summary {Unlabeled} (SIIT Real Return Fund)</link:definition>
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        <link:definition>061109 - Schedule - Annual Fund Operating Expenses</link:definition>
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      <link:roleType roleURI="http://www.seic.com/role/ExpenseExample_S000013606Member" id="ExpenseExample_S000013606Member">
        <link:definition>061110 - Schedule - Expense Example {Transposed}</link:definition>
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        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
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      <link:roleType roleURI="http://www.seic.com/role/BarChartData_S000013606Member" id="BarChartData_S000013606Member">
        <link:definition>061111 - Schedule - Annual Total Returns</link:definition>
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        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
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      <link:roleType roleURI="http://www.seic.com/role/PerformanceTableData_S000013606Member" id="PerformanceTableData_S000013606Member">
        <link:definition>061112 - Schedule - Average Annual Total Returns {Transposed}</link:definition>
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        <link:definition>061113 - Disclosure - Risk/Return Detail Data {Elements} (SIIT Real Return Fund)</link:definition>
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        <link:definition>061114 - Document - Risk/Return Summary {Unlabeled} (SIIT Dynamic Asset Allocation Fund)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
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</schema>
