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of Standards and Technology |url=https://nvlpubs.nist.gov/nistpubs/Legacy/SP/nistspecialpublication800-95.pdf}}</ref>
Unlike [[RBAC|role-based access control (RBAC)]], which defines roles that carry a specific set of privileges associated with them and to which subjects are assigned, ABAC can express complex rule sets that can evaluate many different attributes.
Attribute values can be set-valued or atomic-valued. Set-valued attributes contain more than one atomic value. Examples are ''role'' and ''project''. Atomic-valued attributes contain only one atomic value. Examples are ''clearance'' and ''sensitivity''. Attributes can be compared to static values or to one another, thus enabling relation-based access control.
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