<Assertion ID="_abc123">
<Signature>
<SignedInfo>
<Reference URI="#_abc123">
<DigestMethod Algorithm="http://www.w3.org/2001/04/xmlenc#sha256" />
<DigestValue>abc123DigestValue</DigestValue>
</Reference>
</SignedInfo>
<SignatureValue>SignedWithPrivateKey</SignatureValue>
</Signature>
<!-- Assertion contents -->
</Assertion>