Used to indicate whether or
not to include element StatementMetadata when referencing an Assertion. In the
case of signatures and binding, this attribute indicates whether or not the
statement metadata is covered by the signature or binding. If not, it cannot be
cryptographically verified and should be considered informative only.
IncludesStatementMetadata should never be set on SignatureValue if there is a
boundValueList, because the BoundValue elements in the list each have their own
explicit includesStatementMetadata attribute.