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ds:Signatureelement contains a valid signature. Certificate is bound to the certificate that appears in the element if the signature is valid. It is up to the caller to determine if the certificate is trusted or not.
Note: The DOM and SignatureDOM must have been obtained using
the load_structure/3 option
keep_prefix(true) otherwise it is
impossible to generate an identical document for checking the
signature. See also xml_write_canonical/3.