2.2.5.4 A_ARG_TYPE_Authenticator
This type of element is an authenticator and is the 160-bit (20-octet) result of the HMAC-SHA-1 message authentication code [RFC2104], as specified in section 3.1.1, encoded as a base64 string.
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<xs:simpleType name="A_ARG_TYPE_Authenticator" > <xs:restriction base="xs:string"/> </xs:simpleType>