2.2.1.7.1 SignedInfo Element
The <SignedInfo> element is specified in [XMLDSig/2008] section 4.3. This document overrides the following text:
[XMLDSig/2008] section 4.3.2: "element name="HMACOutputLength" minOccurs="0" type="ds:HMACOutputlengthType"/>."
This element MUST NOT be present as specified in [BSP] section 8.7.2.