<?xml version='1.0' encoding='US-ASCII'?><schema xmlns="http://www.w3.org/2001/XMLSchema" xmlns:nacc2="http://nacc2/20260531" xmlns:dei="http://xbrl.sec.gov/dei/2025" xmlns:srt-types="http://fasb.org/srt-types/2025" xmlns:deprecated="http://www.xbrl.org/2009/role/deprecated" xmlns:dtr="http://www.xbrl.org/2009/dtr" xmlns:oef="http://xbrl.sec.gov/oef/2025" xmlns:ref="http://www.xbrl.org/2006/ref" xmlns:xbrldt="http://xbrl.org/2005/xbrldt" xmlns:xl="http://www.xbrl.org/2003/XLink" xmlns:us-gaap="http://fasb.org/us-gaap/2025" xmlns:oef-pre="http://xbrl.sec.gov/oef-pre/2025" xmlns:oef-lab="http://xbrl.sec.gov/oef-lab/2025" xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:country="http://xbrl.sec.gov/country/2025" xmlns:us-roles="http://fasb.org/us-roles/2025" xmlns:enum2="http://xbrl.org/2020/extensible-enumerations-2.0" xmlns:us-types="http://fasb.org/us-types/2025" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:dtr-types="http://www.xbrl.org/dtr/type/2022-03-31" xmlns:oef-def="http://xbrl.sec.gov/oef-def/2025" xmlns:negated="http://www.xbrl.org/2009/role/negated" xmlns:xbrldi="http://xbrl.org/2006/xbrldi" xmlns:srt="http://fasb.org/srt/2025" xmlns:oef-sr="http://xbrl.sec.gov/oef-sr/2025" xmlns:srt-roles="http://fasb.org/srt-roles/2025" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xbrli="http://www.xbrl.org/2003/instance" targetNamespace="http://nacc2/20260531" elementFormDefault="qualified"><import namespace="http://www.xbrl.org/2003/instance" schemaLocation="http://www.xbrl.org/2003/xbrl-instance-2003-12-31.xsd"/><import namespace="http://www.xbrl.org/2003/linkbase" schemaLocation="http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd"/><import namespace="http://xbrl.sec.gov/dei/2025" schemaLocation="https://xbrl.sec.gov/dei/2025/dei-2025.xsd"/><import namespace="http://fasb.org/us-types/2025" schemaLocation="https://xbrl.fasb.org/us-gaap/2025/elts/us-types-2025.xsd"/><import namespace="http://www.xbrl.org/dtr/type/2022-03-31" schemaLocation="https://www.xbrl.org/dtr/type/2022-03-31/types.xsd"/><import namespace="http://xbrl.sec.gov/country/2025" schemaLocation="https://xbrl.sec.gov/country/2025/country-2025.xsd"/><import namespace="http://fasb.org/srt/2025" schemaLocation="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd"/><import namespace="http://fasb.org/srt-types/2025" schemaLocation="https://xbrl.fasb.org/srt/2025/elts/srt-types-2025.xsd"/><import namespace="http://xbrl.sec.gov/oef-sr/2025" schemaLocation="https://xbrl.sec.gov/oef/2025/oef-sr-2025.xsd"/><import namespace="http://fasb.org/us-gaap/2025" schemaLocation="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd"/><import namespace="http://fasb.org/us-roles/2025" schemaLocation="https://xbrl.fasb.org/us-gaap/2025/elts/us-roles-2025.xsd"/><import namespace="http://fasb.org/srt-roles/2025" schemaLocation="https://xbrl.fasb.org/srt/2025/elts/srt-roles-2025.xsd"/><annotation><appinfo><link:linkbase id="lnk"><link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/domain-member" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#domain-member"/><link:roleRef roleURI="http://xbrl.sec.gov/oef/role/ShareholderReport" xlink:type="simple" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#ShareholderReport"/><link:roleRef roleURI="http://xbrl.sec.gov/oef/role/ShareholderReportHoldingsDetails" xlink:type="simple" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#ShareholderReportHoldingsDetails"/><link:roleRef roleURI="http://xbrl.sec.gov/oef/role/ShareholderReportLineGraphDetails" xlink:type="simple" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#ShareholderReportLineGraphDetails"/><link:roleRef roleURI="http://xbrl.sec.gov/oef/role/ShareholderReportAverageAnnualReturnDetails" xlink:type="simple" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#ShareholderReportAverageAnnualReturnDetails"/><link:roleRef roleURI="http://xbrl.sec.gov/oef/role/ClassOnly" xlink:type="simple" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#ClassOnly"/><link:roleRef roleURI="http://xbrl.sec.gov/oef/role/Other1CategoryOnly" xlink:type="simple" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#Other1CategoryOnly"/><link:presentationLink xlink:type="extended" xlink:role="http://xbrl.sec.gov/oef/role/ShareholderReport"><link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#oef_ShareClassDomain" xlink:label="ShareClassDomain"/><link:loc xlink:type="locator" xlink:href="#nacc2_C000007969Member" xlink:label="C000007969Member"/><link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="ShareClassDomain" xlink:to="C000007969Member" order="1.0" preferredLabel="http://www.xbrl.org/2003/role/label" priority="1"/><link:loc xlink:type="locator" xlink:href="#nacc2_C000007970Member" xlink:label="C000007970Member"/><link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="ShareClassDomain" xlink:to="C000007970Member" order="2.0" preferredLabel="http://www.xbrl.org/2003/role/label" priority="1"/><link:loc xlink:type="locator" xlink:href="#nacc2_C000007971Member" xlink:label="C000007971Member"/><link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="ShareClassDomain" xlink:to="C000007971Member" order="3.0" preferredLabel="http://www.xbrl.org/2003/role/label" priority="1"/><link:loc xlink:type="locator" xlink:href="#nacc2_C000260432Member" xlink:label="C000260432Member"/><link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="ShareClassDomain" xlink:to="C000260432Member" order="4.0" preferredLabel="http://www.xbrl.org/2003/role/label" priority="1"/></link:presentationLink><link:presentationLink xlink:type="extended" xlink:role="http://xbrl.sec.gov/oef/role/ShareholderReportHoldingsDetails"><link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#oef_ShareClassDomain" xlink:label="ShareClassDomain"/><link:loc xlink:type="locator" xlink:href="#nacc2_C000007969Member" xlink:label="C000007969Member"/><link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="ShareClassDomain" xlink:to="C000007969Member" order="1.0" preferredLabel="http://www.xbrl.org/2003/role/label" priority="1"/><link:loc xlink:type="locator" xlink:href="#nacc2_C000007970Member" xlink:label="C000007970Member"/><link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="ShareClassDomain" xlink:to="C000007970Member" order="2.0" preferredLabel="http://www.xbrl.org/2003/role/label" priority="1"/><link:loc xlink:type="locator" xlink:href="#nacc2_C000007971Member" xlink:label="C000007971Member"/><link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="ShareClassDomain" xlink:to="C000007971Member" order="3.0" preferredLabel="http://www.xbrl.org/2003/role/label" priority="1"/><link:loc xlink:type="locator" xlink:href="#nacc2_C000260432Member" xlink:label="C000260432Member"/><link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="ShareClassDomain" xlink:to="C000260432Member" order="4.0" preferredLabel="http://www.xbrl.org/2003/role/label" priority="1"/><link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#oef_OtherCategory1Domain" xlink:label="OtherCategory1Domain"/><link:loc xlink:type="locator" xlink:href="#nacc2_Lessthan1YearCTIMember" xlink:label="Lessthan1YearCTIMember"/><link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="OtherCategory1Domain" xlink:to="Lessthan1YearCTIMember" order="1.0" preferredLabel="http://www.xbrl.org/2003/role/label" priority="1"/><link:loc xlink:type="locator" xlink:href="#nacc2_A1to3YearsCTIMember" xlink:label="A1to3YearsCTIMember"/><link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="OtherCategory1Domain" xlink:to="A1to3YearsCTIMember" order="2.0" preferredLabel="http://www.xbrl.org/2003/role/label" priority="1"/><link:loc xlink:type="locator" xlink:href="#nacc2_A3to5YearsCTIMember" xlink:label="A3to5YearsCTIMember"/><link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="OtherCategory1Domain" xlink:to="A3to5YearsCTIMember" order="3.0" preferredLabel="http://www.xbrl.org/2003/role/label" priority="1"/><link:loc xlink:type="locator" xlink:href="#nacc2_A5to10YearsCTIMember" xlink:label="A5to10YearsCTIMember"/><link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="OtherCategory1Domain" xlink:to="A5to10YearsCTIMember" order="4.0" preferredLabel="http://www.xbrl.org/2003/role/label" priority="1"/><link:loc xlink:type="locator" xlink:href="#nacc2_A10to20YearsCTIMember" xlink:label="A10to20YearsCTIMember"/><link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="OtherCategory1Domain" xlink:to="A10to20YearsCTIMember" order="5.0" preferredLabel="http://www.xbrl.org/2003/role/label" priority="1"/><link:loc xlink:type="locator" xlink:href="#nacc2_A20to30YearsCTIMember" xlink:label="A20to30YearsCTIMember"/><link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="OtherCategory1Domain" xlink:to="A20to30YearsCTIMember" order="6.0" preferredLabel="http://www.xbrl.org/2003/role/label" priority="1"/><link:loc xlink:type="locator" xlink:href="#nacc2_Greaterthan30YearsCTIMember" xlink:label="Greaterthan30YearsCTIMember"/><link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="OtherCategory1Domain" xlink:to="Greaterthan30YearsCTIMember" order="7.0" preferredLabel="http://www.xbrl.org/2003/role/label" priority="1"/><link:loc xlink:type="locator" xlink:href="#nacc2_OtherLineCTIMember" xlink:label="OtherLineCTIMember"/><link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="OtherCategory1Domain" xlink:to="OtherLineCTIMember" order="8.0" preferredLabel="http://www.xbrl.org/2003/role/label" priority="1"/><link:loc xlink:type="locator" xlink:href="#nacc2_A1to7DaysCTIMember" xlink:label="A1to7DaysCTIMember"/><link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="OtherCategory1Domain" xlink:to="A1to7DaysCTIMember" order="9.0" preferredLabel="http://www.xbrl.org/2003/role/label" priority="1"/><link:loc xlink:type="locator" xlink:href="#nacc2_A8to30DaysCTIMember" xlink:label="A8to30DaysCTIMember"/><link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="OtherCategory1Domain" xlink:to="A8to30DaysCTIMember" order="10.0" preferredLabel="http://www.xbrl.org/2003/role/label" priority="1"/><link:loc xlink:type="locator" xlink:href="#nacc2_A31to60DaysCTIMember" xlink:label="A31to60DaysCTIMember"/><link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="OtherCategory1Domain" xlink:to="A31to60DaysCTIMember" order="11.0" preferredLabel="http://www.xbrl.org/2003/role/label" priority="1"/><link:loc xlink:type="locator" xlink:href="#nacc2_A61to90DaysCTIMember" xlink:label="A61to90DaysCTIMember"/><link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="OtherCategory1Domain" xlink:to="A61to90DaysCTIMember" order="12.0" preferredLabel="http://www.xbrl.org/2003/role/label" priority="1"/><link:loc xlink:type="locator" xlink:href="#nacc2_A91to180DaysCTIMember" xlink:label="A91to180DaysCTIMember"/><link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="OtherCategory1Domain" xlink:to="A91to180DaysCTIMember" order="13.0" preferredLabel="http://www.xbrl.org/2003/role/label" priority="1"/><link:loc xlink:type="locator" xlink:href="#nacc2_Over180DaysCTIMember" xlink:label="Over180DaysCTIMember"/><link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="OtherCategory1Domain" xlink:to="Over180DaysCTIMember" order="14.0" preferredLabel="http://www.xbrl.org/2003/role/label" priority="1"/></link:presentationLink><link:presentationLink xlink:type="extended" xlink:role="http://xbrl.sec.gov/oef/role/ShareholderReportLineGraphDetails"><link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#oef_ShareClassDomain" xlink:label="ShareClassDomain"/><link:loc xlink:type="locator" xlink:href="#nacc2_C000007969Member" xlink:label="C000007969Member"/><link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="ShareClassDomain" xlink:to="C000007969Member" order="1.0" preferredLabel="http://www.xbrl.org/2003/role/label" priority="1"/><link:loc xlink:type="locator" xlink:href="#nacc2_C000007970Member" xlink:label="C000007970Member"/><link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="ShareClassDomain" xlink:to="C000007970Member" order="2.0" preferredLabel="http://www.xbrl.org/2003/role/label" priority="1"/><link:loc xlink:type="locator" xlink:href="#nacc2_C000007971Member" xlink:label="C000007971Member"/><link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="ShareClassDomain" xlink:to="C000007971Member" order="3.0" preferredLabel="http://www.xbrl.org/2003/role/label" priority="1"/><link:loc xlink:type="locator" xlink:href="#nacc2_C000260432Member" xlink:label="C000260432Member"/><link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="ShareClassDomain" xlink:to="C000260432Member" order="4.0" preferredLabel="http://www.xbrl.org/2003/role/label" priority="1"/></link:presentationLink><link:presentationLink xlink:type="extended" xlink:role="http://xbrl.sec.gov/oef/role/ShareholderReportAverageAnnualReturnDetails"><link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#oef_ShareClassDomain" xlink:label="ShareClassDomain"/><link:loc xlink:type="locator" xlink:href="#nacc2_C000007969Member" xlink:label="C000007969Member"/><link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="ShareClassDomain" xlink:to="C000007969Member" order="1.0" preferredLabel="http://www.xbrl.org/2003/role/label" priority="1"/><link:loc xlink:type="locator" xlink:href="#nacc2_C000007970Member" xlink:label="C000007970Member"/><link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="ShareClassDomain" xlink:to="C000007970Member" order="2.0" preferredLabel="http://www.xbrl.org/2003/role/label" priority="1"/><link:loc xlink:type="locator" xlink:href="#nacc2_C000007971Member" xlink:label="C000007971Member"/><link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="ShareClassDomain" xlink:to="C000007971Member" order="3.0" preferredLabel="http://www.xbrl.org/2003/role/label" priority="1"/><link:loc xlink:type="locator" xlink:href="#nacc2_C000260432Member" xlink:label="C000260432Member"/><link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="ShareClassDomain" xlink:to="C000260432Member" order="4.0" preferredLabel="http://www.xbrl.org/2003/role/label" priority="1"/></link:presentationLink><link:definitionLink xlink:type="extended" xlink:role="http://xbrl.sec.gov/oef/role/ClassOnly"><link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#oef_ShareClassDomain" xlink:label="ShareClassDomain"/><link:loc xlink:type="locator" xlink:href="#nacc2_C000007969Member" xlink:label="C000007969Member"/><link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ShareClassDomain" xlink:to="C000007969Member" order="1.0" priority="1"/><link:loc xlink:type="locator" xlink:href="#nacc2_C000007970Member" xlink:label="C000007970Member"/><link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ShareClassDomain" xlink:to="C000007970Member" order="2.0" priority="1"/><link:loc xlink:type="locator" xlink:href="#nacc2_C000007971Member" xlink:label="C000007971Member"/><link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ShareClassDomain" xlink:to="C000007971Member" order="3.0" priority="1"/><link:loc xlink:type="locator" xlink:href="#nacc2_C000260432Member" xlink:label="C000260432Member"/><link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ShareClassDomain" xlink:to="C000260432Member" order="4.0" priority="1"/></link:definitionLink><link:definitionLink xlink:type="extended" xlink:role="http://xbrl.sec.gov/oef/role/Other1CategoryOnly"><link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#oef_OtherCategory1Domain" xlink:label="OtherCategory1Domain"/><link:loc xlink:type="locator" xlink:href="#nacc2_Lessthan1YearCTIMember" xlink:label="Lessthan1YearCTIMember"/><link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="OtherCategory1Domain" xlink:to="Lessthan1YearCTIMember" order="1.0" priority="1"/><link:loc xlink:type="locator" xlink:href="#nacc2_A1to3YearsCTIMember" xlink:label="A1to3YearsCTIMember"/><link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="OtherCategory1Domain" xlink:to="A1to3YearsCTIMember" order="2.0" priority="1"/><link:loc xlink:type="locator" xlink:href="#nacc2_A3to5YearsCTIMember" xlink:label="A3to5YearsCTIMember"/><link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="OtherCategory1Domain" xlink:to="A3to5YearsCTIMember" order="3.0" priority="1"/><link:loc xlink:type="locator" xlink:href="#nacc2_A5to10YearsCTIMember" xlink:label="A5to10YearsCTIMember"/><link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="OtherCategory1Domain" xlink:to="A5to10YearsCTIMember" order="4.0" priority="1"/><link:loc xlink:type="locator" xlink:href="#nacc2_A10to20YearsCTIMember" xlink:label="A10to20YearsCTIMember"/><link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="OtherCategory1Domain" xlink:to="A10to20YearsCTIMember" order="5.0" priority="1"/><link:loc xlink:type="locator" xlink:href="#nacc2_A20to30YearsCTIMember" xlink:label="A20to30YearsCTIMember"/><link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="OtherCategory1Domain" xlink:to="A20to30YearsCTIMember" order="6.0" priority="1"/><link:loc xlink:type="locator" xlink:href="#nacc2_Greaterthan30YearsCTIMember" xlink:label="Greaterthan30YearsCTIMember"/><link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="OtherCategory1Domain" xlink:to="Greaterthan30YearsCTIMember" order="7.0" priority="1"/><link:loc xlink:type="locator" xlink:href="#nacc2_OtherLineCTIMember" xlink:label="OtherLineCTIMember"/><link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="OtherCategory1Domain" xlink:to="OtherLineCTIMember" order="8.0" priority="1"/><link:loc xlink:type="locator" xlink:href="#nacc2_A1to7DaysCTIMember" xlink:label="A1to7DaysCTIMember"/><link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="OtherCategory1Domain" xlink:to="A1to7DaysCTIMember" order="9.0" priority="1"/><link:loc xlink:type="locator" xlink:href="#nacc2_A8to30DaysCTIMember" xlink:label="A8to30DaysCTIMember"/><link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="OtherCategory1Domain" xlink:to="A8to30DaysCTIMember" order="10.0" priority="1"/><link:loc xlink:type="locator" xlink:href="#nacc2_A31to60DaysCTIMember" xlink:label="A31to60DaysCTIMember"/><link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="OtherCategory1Domain" xlink:to="A31to60DaysCTIMember" order="11.0" priority="1"/><link:loc xlink:type="locator" xlink:href="#nacc2_A61to90DaysCTIMember" xlink:label="A61to90DaysCTIMember"/><link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="OtherCategory1Domain" xlink:to="A61to90DaysCTIMember" order="12.0" priority="1"/><link:loc xlink:type="locator" xlink:href="#nacc2_A91to180DaysCTIMember" xlink:label="A91to180DaysCTIMember"/><link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="OtherCategory1Domain" xlink:to="A91to180DaysCTIMember" order="13.0" priority="1"/><link:loc xlink:type="locator" xlink:href="#nacc2_Over180DaysCTIMember" xlink:label="Over180DaysCTIMember"/><link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="OtherCategory1Domain" xlink:to="Over180DaysCTIMember" order="14.0" priority="1"/></link:definitionLink><link:labelLink xlink:type="extended" xlink:role="http://www.xbrl.org/2003/role/link"><link:loc xlink:type="locator" xlink:href="#nacc2_C000007969Member" xlink:label="C000007969Member"/><link:label xlink:type="resource" xlink:label="label_C000007969Member" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">C000007969</link:label><link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="C000007969Member" xlink:to="label_C000007969Member" priority="1"/><link:loc xlink:type="locator" xlink:href="#nacc2_C000007970Member" xlink:label="C000007970Member"/><link:label xlink:type="resource" xlink:label="label_C000007970Member" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">C000007970</link:label><link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="C000007970Member" xlink:to="label_C000007970Member" priority="1"/><link:loc xlink:type="locator" xlink:href="#nacc2_C000007971Member" xlink:label="C000007971Member"/><link:label xlink:type="resource" xlink:label="label_C000007971Member" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">C000007971</link:label><link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="C000007971Member" xlink:to="label_C000007971Member" priority="1"/><link:loc xlink:type="locator" xlink:href="#nacc2_C000260432Member" xlink:label="C000260432Member"/><link:label xlink:type="resource" xlink:label="label_C000260432Member" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">C000260432</link:label><link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="C000260432Member" xlink:to="label_C000260432Member" priority="1"/><link:loc xlink:type="locator" xlink:href="#nacc2_Lessthan1YearCTIMember" xlink:label="Lessthan1YearCTIMember"/><link:label xlink:type="resource" xlink:label="label_Lessthan1YearCTIMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Less than 1 Year</link:label><link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="Lessthan1YearCTIMember" xlink:to="label_Lessthan1YearCTIMember" priority="1"/><link:loc xlink:type="locator" xlink:href="#nacc2_A1to3YearsCTIMember" xlink:label="A1to3YearsCTIMember"/><link:label xlink:type="resource" xlink:label="label_A1to3YearsCTIMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">1 to 3 Years</link:label><link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="A1to3YearsCTIMember" xlink:to="label_A1to3YearsCTIMember" priority="1"/><link:loc xlink:type="locator" xlink:href="#nacc2_A3to5YearsCTIMember" xlink:label="A3to5YearsCTIMember"/><link:label xlink:type="resource" xlink:label="label_A3to5YearsCTIMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">3 to 5 Years</link:label><link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="A3to5YearsCTIMember" xlink:to="label_A3to5YearsCTIMember" priority="1"/><link:loc xlink:type="locator" xlink:href="#nacc2_A5to10YearsCTIMember" xlink:label="A5to10YearsCTIMember"/><link:label xlink:type="resource" xlink:label="label_A5to10YearsCTIMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">5 to 10 Years</link:label><link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="A5to10YearsCTIMember" xlink:to="label_A5to10YearsCTIMember" priority="1"/><link:loc xlink:type="locator" xlink:href="#nacc2_A10to20YearsCTIMember" xlink:label="A10to20YearsCTIMember"/><link:label xlink:type="resource" xlink:label="label_A10to20YearsCTIMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">10 to 20 Years</link:label><link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="A10to20YearsCTIMember" xlink:to="label_A10to20YearsCTIMember" priority="1"/><link:loc xlink:type="locator" xlink:href="#nacc2_A20to30YearsCTIMember" xlink:label="A20to30YearsCTIMember"/><link:label xlink:type="resource" xlink:label="label_A20to30YearsCTIMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">20 to 30 Years</link:label><link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="A20to30YearsCTIMember" xlink:to="label_A20to30YearsCTIMember" priority="1"/><link:loc xlink:type="locator" xlink:href="#nacc2_Greaterthan30YearsCTIMember" xlink:label="Greaterthan30YearsCTIMember"/><link:label xlink:type="resource" xlink:label="label_Greaterthan30YearsCTIMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Greater than 30 Years</link:label><link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="Greaterthan30YearsCTIMember" xlink:to="label_Greaterthan30YearsCTIMember" priority="1"/><link:loc xlink:type="locator" xlink:href="#nacc2_OtherLineCTIMember" xlink:label="OtherLineCTIMember"/><link:label xlink:type="resource" xlink:label="label_OtherLineCTIMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Other Line</link:label><link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OtherLineCTIMember" xlink:to="label_OtherLineCTIMember" priority="1"/><link:loc xlink:type="locator" xlink:href="#nacc2_A1to7DaysCTIMember" xlink:label="A1to7DaysCTIMember"/><link:label xlink:type="resource" xlink:label="label_A1to7DaysCTIMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">1 to 7 Days</link:label><link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="A1to7DaysCTIMember" xlink:to="label_A1to7DaysCTIMember" priority="1"/><link:loc xlink:type="locator" xlink:href="#nacc2_A8to30DaysCTIMember" xlink:label="A8to30DaysCTIMember"/><link:label xlink:type="resource" xlink:label="label_A8to30DaysCTIMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">8 to 30 Days</link:label><link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="A8to30DaysCTIMember" xlink:to="label_A8to30DaysCTIMember" priority="1"/><link:loc xlink:type="locator" xlink:href="#nacc2_A31to60DaysCTIMember" xlink:label="A31to60DaysCTIMember"/><link:label xlink:type="resource" xlink:label="label_A31to60DaysCTIMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">31 to 60 Days</link:label><link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="A31to60DaysCTIMember" xlink:to="label_A31to60DaysCTIMember" priority="1"/><link:loc xlink:type="locator" xlink:href="#nacc2_A61to90DaysCTIMember" xlink:label="A61to90DaysCTIMember"/><link:label xlink:type="resource" xlink:label="label_A61to90DaysCTIMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">61 to 90 Days</link:label><link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="A61to90DaysCTIMember" xlink:to="label_A61to90DaysCTIMember" priority="1"/><link:loc xlink:type="locator" xlink:href="#nacc2_A91to180DaysCTIMember" xlink:label="A91to180DaysCTIMember"/><link:label xlink:type="resource" xlink:label="label_A91to180DaysCTIMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">91 to 180 Days</link:label><link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="A91to180DaysCTIMember" xlink:to="label_A91to180DaysCTIMember" priority="1"/><link:loc xlink:type="locator" xlink:href="#nacc2_Over180DaysCTIMember" xlink:label="Over180DaysCTIMember"/><link:label xlink:type="resource" xlink:label="label_Over180DaysCTIMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Over 180 Days</link:label><link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="Over180DaysCTIMember" xlink:to="label_Over180DaysCTIMember" priority="1"/><link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_NoTradingSymbolFlag" xlink:label="NoTradingSymbolFlag"/><link:label xlink:type="resource" xlink:label="label_NoTradingSymbolFlag" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">No Trading Symbol [Flag]</link:label><link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="NoTradingSymbolFlag" xlink:to="label_NoTradingSymbolFlag" priority="1"/><link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetsNet" xlink:label="AssetsNet"/><link:label xlink:type="resource" xlink:label="label_AssetsNet" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">AssetsNet</link:label><link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="AssetsNet" xlink:to="label_AssetsNet" priority="1"/><link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InvestmentCompanyPortfolioTurnover" xlink:label="InvestmentCompanyPortfolioTurnover"/><link:label xlink:type="resource" xlink:label="label_InvestmentCompanyPortfolioTurnover" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">InvestmentCompanyPortfolioTurnover</link:label><link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="InvestmentCompanyPortfolioTurnover" xlink:to="label_InvestmentCompanyPortfolioTurnover" priority="1"/></link:labelLink></link:linkbase></appinfo></annotation><element name="C000007969Member" id="nacc2_C000007969Member" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/><element name="C000007970Member" id="nacc2_C000007970Member" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/><element name="C000007971Member" id="nacc2_C000007971Member" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/><element name="C000260432Member" id="nacc2_C000260432Member" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/><element name="Lessthan1YearCTIMember" id="nacc2_Lessthan1YearCTIMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/><element name="A1to3YearsCTIMember" id="nacc2_A1to3YearsCTIMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/><element name="A3to5YearsCTIMember" id="nacc2_A3to5YearsCTIMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/><element name="A5to10YearsCTIMember" id="nacc2_A5to10YearsCTIMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/><element name="A10to20YearsCTIMember" id="nacc2_A10to20YearsCTIMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/><element name="A20to30YearsCTIMember" id="nacc2_A20to30YearsCTIMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/><element name="Greaterthan30YearsCTIMember" id="nacc2_Greaterthan30YearsCTIMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/><element name="OtherLineCTIMember" id="nacc2_OtherLineCTIMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/><element name="A1to7DaysCTIMember" id="nacc2_A1to7DaysCTIMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/><element name="A8to30DaysCTIMember" id="nacc2_A8to30DaysCTIMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/><element name="A31to60DaysCTIMember" id="nacc2_A31to60DaysCTIMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/><element name="A61to90DaysCTIMember" id="nacc2_A61to90DaysCTIMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/><element name="A91to180DaysCTIMember" id="nacc2_A91to180DaysCTIMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/><element name="Over180DaysCTIMember" id="nacc2_Over180DaysCTIMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/></schema>
