Adding Another IDP Signing Certificate in Shib 3.x SP

[Bhagwat, Shrikant]

I have SAML 2.0 IDP , their existing signing certificate is expiring. They have added new signing certificate. How can modify Shibboleth2.xml file to recognize two IDP Signing cert at same time.
Below is my "MetadataProvider" Element

<MetadataProvider type="XML" url="https://lab-weblogin.med.umich.edu/nidp/saml2/metadata"
            backingFilePath="lab-weblogin-metadata.xml" reloadInterval="7200">
            <MetadataFilter type="Signature" certificate="Lab-WebloginFull.pem"/>
        </MetadataProvider>
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