Identifies the algorithm used to compute the value of the digital signature.
Select http://www.w3.org/2000/09/xmldsig#dsa-sha1, http://www.w3.org/2000/09/xmldsig#rsa-sha1, or http://www.w3.org/2000/09/xmldsig#hmac-sha1; not required.
http://www.w3.org/2000/09/xmldsig#dsa-sha1