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<!-- inside the ChainingMetadataProvider -->
<MetadataProvider xmlns="urn:mace:shibboleth:2.0:metadata" 
    id="ICMD" xsi:type="FileBackedHTTPMetadataProvider"
    maxRefreshDelay="P8HPT8H"
    metadataURL="http://wayf.incommonfederation.org/InCommon/InCommon-metadata.xml"
    backingFile="/opt/shibboleth-idp/metadata/InCommon-metadata.xml">
  <MetadataFilter xsi:type="ChainingFilter">
    <!-- Require metadata expiration at least monthly (28 days) -->
    <MetadataFilter xsi:type="RequiredValidUntil" maxValidityInterval="2419200" />
    <MetadataFilter xsi:type="SignatureValidation" 
        trustEngineRef="ICTrust" requireSignedMetadata="true" />
    <MetadataFilter xsi:type="EntityRoleWhiteList">
      <RetainedRole>samlmd:SPSSODescriptor</RetainedRole>
    </MetadataFilter>
  </MetadataFilter>
</MetadataProvider>

...

<!- underneath the Security Configuration section -->
<security:TrustEngine id="ICTrust" xsi:type="security:StaticExplicitKeySignature">
  <security:Credential id="MyFederation1Credentials" xsi:type="security:X509Filesystem">
    <security:Certificate>/opt/shibboleth-idp/credentials/incommon.pem</security:Certificate>
  </security:Credential>
</security:TrustEngine>