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Source1

{
  "resourceType": "CodeSystem",
  "id": "permission-rule-combining",
  "text": {
    "status": "generated",
    "div": "<!-- snip (see above) -->"
  },
  "extension": [
    {
      "url": "http://hl7.org/fhir/StructureDefinition/structuredefinition-standards-status",
      "valueCode": "trial-use"
    },
    {
      "url": "http://hl7.org/fhir/StructureDefinition/structuredefinition-fmm",
      "valueInteger": 0
    },
    {
      "extension": [
        {
          "url": "packageId",
          "valueId": "hl7.fhir.uv.xver-r5.r4b"
        },
        {
          "url": "version",
          "valueString": "0.0.1-snapshot-2"
        }
      ],
      "url": "http://hl7.org/fhir/StructureDefinition/package-source"
    },
    {
      "url": "http://hl7.org/fhir/StructureDefinition/structuredefinition-wg",
      "valueCode": "sec"
    }
  ],
  "url": "http://hl7.org/fhir/permission-rule-combining",
  "version": "5.0.0",
  "name": "PermissionRuleCombining",
  "title": "Permission Rule Combining",
  "status": "active",
  "experimental": false,
  "date": "2022-08-05T09:01:24+10:00",
  "publisher": "Security",
  "contact": [
    {
      "name": "Security",
      "telecom": [
        {
          "system": "url",
          "value": "http://www.hl7.org/Special/committees/secure"
        }
      ]
    }
  ],
  "description": "Codes identifying the rule combining. See XACML Combining algorithms  http://docs.oasis-open.org/xacml/3.0/xacml-3.0-core-spec-cos01-en.html",
  "jurisdiction": [
    {
      "coding": [
        {
          "system": "http://unstats.un.org/unsd/methods/m49/m49.htm",
          "code": "001",
          "display": "World"
        }
      ]
    }
  ],
  "caseSensitive": true,
  "content": "complete",
  "concept": [
    {
      "code": "deny-overrides",
      "display": "Deny-overrides",
      "definition": "The deny overrides combining algorithm is intended for those cases where a deny decision should have priority over a permit decision."
    },
    {
      "code": "permit-overrides",
      "display": "Permit-overrides",
      "definition": "The permit overrides combining algorithm is intended for those cases where a permit decision should have priority over a deny decision."
    },
    {
      "code": "ordered-deny-overrides",
      "display": "Ordered-deny-overrides",
      "definition": "The behavior of this algorithm is identical to that of the “Deny-overrides” rule-combining algorithm with one exception.  The order in which the collection of rules is evaluated SHALL match the order as listed in the permission."
    },
    {
      "code": "ordered-permit-overrides",
      "display": "Ordered-permit-overrides",
      "definition": "The behavior of this algorithm is identical to that of the “Permit-overrides” rule-combining algorithm with one exception.  The order in which the collection of rules is evaluated SHALL match the order as listed in the permission."
    },
    {
      "code": "deny-unless-permit",
      "display": "Deny-unless-permit",
      "definition": "The “Deny-unless-permit” combining algorithm is intended for those cases where a permit decision should have priority over a deny decision, and an “Indeterminate” or “NotApplicable” must never be the result. It is particularly useful at the top level in a policy structure to ensure that a PDP will always return a definite “Permit” or “Deny” result."
    },
    {
      "code": "permit-unless-deny",
      "display": "Permit-unless-deny",
      "definition": "The “Permit-unless-deny” combining algorithm is intended for those cases where a deny decision should have priority over a permit decision, and an “Indeterminate” or “NotApplicable” must never be the result. It is particularly useful at the top level in a policy structure to ensure that a PDP will always return a definite “Permit” or “Deny” result. This algorithm has the following behavior."
    }
  ]
}