The ABAC tie in to RBAC, RAdAC and SAML

I was in a conversation recently in regards to Extensible Access Control Mark-up Language (XACML) and  Attribute Based Access Control’s (ABAC) role in Role Based Access Control (RBAC), Risk Adaptable Based Access Control (RAdAC) and Security Access Mark-up Language (SAML).  The question surrounded whether ABAC can or should replace the other Access Control models and/or
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