Document title: SAML AC Extension Schema for Shared Credentials Document identifier: sstc-saml-protocol-ext-sc.xsd Revision history: V1.0 (September 2006): The SharedCredential Extension MUST NOT occur any other place than in the Extension element of the PrincipalAuthenticatioMechanism element within a an Authentication Context declaration. A value of '0' for the extensions content indicates that the credential by which a user authenticated was not shared, a value of '1' that the credential by which a user authenticated was shared,