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+.. This work is licensed under a Creative Commons Attribution 4.0 International License.
+.. http://creativecommons.org/licenses/by/4.0
+.. Copyright (C) 2020 Nordix
+
+.. _a1-adapter-api:
+
+.. |nbsp| unicode:: 0xA0
+   :trim:
+
+.. |nbh| unicode:: 0x2011
+   :trim:
+
+##############
+A1 Adapter API
+##############
+
+The A1 of a Near |nbh| RT |nbsp| RIC can be used through the A1 Adapter.
+
+The A1 Adapter supports using multiple versions of A1 API southbound. By passing the full URL for each southbound
+A1 operation the problem of version-specific URL formats is avoided.
+
+Since different versions of A1 operations may use different data formats for data payloads for similar REST requests and
+responses the data formatting requirements are flexible, so version-specific encoding/decoding is handled by the service
+that requests the A1 operation.
+
+Get Policy Type
+~~~~~~~~~~~~~~~
+
+POST
+++++
+
+Gets a policy type.
+
+Definition
+""""""""""
+
+**URL path:**
+
+/restconf/operations/A1-ADAPTER-API:getA1PolicyType
+
+**Parameters:**
+
+None.
+
+**Body:** (*Required*)
+
+A JSON object. ::
+
+  {
+    "input": {
+      "near-rt-ric-url": "<url-to-near-rt-ric-to-get-type>"
+    }
+  }
+
+**Responses:**
+
+200:
+
+A JSON object where the body tag contains the JSON object of the policy type. ::
+
+  {
+    "output": {
+      "http-status": "integer",
+      "body": "{
+        <policy-type>
+      }"
+    }
+  }
+
+Examples
+""""""""
+
+Get a policy type from a Near |nbh| RT |nbsp| RIC that is using the OSC 2.1.0 version. The STD 1.1.3 version does not
+support types, so this function is not available for that version.
+
+**Call**: ::
+
+    curl -X POST "http://localhost:8282/restconf/operations/A1-ADAPTER-API:getA1PolicyType"
+    -H "Content-Type: application/json" -d '{
+      "input": {
+        "near-rt-ric-url": "http://nearRtRic-sim1:8085/a1-p/policytypes/11"
+      }
+    }'
+
+**Result**:
+
+200: ::
+
+  {
+    "output": {
+      "http-status": 200,
+      "body": "{
+        \"$schema\": \"http://json-schema.org/draft-07/schema#\",
+        \"title\": \"Example_QoETarget_1.0.0\",
+        \"description\": \"Example QoE Target policy type\",
+        \"type\": \"object\",
+        \"properties\": {
+          \"scope\": {
+            \"type\": \"object\",
+            \"properties\": {
+              \"ueId\": {
+                \"type\": \"string\"
+              },
+              \"sliceId\": {
+                \"type\": \"string\"
+              },
+              \"qosId\": {
+                \"type\": \"string\"
+              },
+              \"cellId\": {
+                \"type\": \"string\"
+              }
+            },
+            \"additionalProperties\": false,
+            \"required\": [
+              \"ueId\",
+              \"sliceId\"
+            ]
+          },
+          \"statement\": {
+            \"type\": \"object\",
+            \"properties\": {
+              \"qoeScore\": {
+                \"type\": \"number\"
+              },
+              \"initialBuffering\": {
+                \"type\": \"number\"
+              },
+              \"reBuffFreq\": {
+                \"type\": \"number\"
+              },
+              \"stallRatio\": {
+                \"type\": \"number\"
+              }
+            },
+            \"minProperties\": 1,
+            \"additionalProperties\": false
+          }
+        }
+      }"
+    }
+  }
+
+Put Policy
+~~~~~~~~~~
+
+POST
+++++
+
+Creates or updates a policy instance.
+
+Definition
+""""""""""
+
+**URL path:**
+
+/restconf/operations/A1-ADAPTER-API:putA1Policy
+
+**Parameters:**
+
+None.
+
+**Body:** (*Required*)
+
+A JSON object where the body tag contains the JSON object of the policy. ::
+
+  {
+    "input": {
+      "near-rt-ric-url": "<url-to-near-rt-ric-to-put-policy>",
+      "body": "<policy-as-json-string>"
+    }
+  }
+
+**Responses:**
+
+200:
+
+A JSON object with the response. ::
+
+  {
+    "output": {
+      "http-status": "integer"
+    }
+  }
+
+Examples
+""""""""
+
+**Call**:
+
+Create a policy in a Near |nbh| RT |nbsp| RIC that is using the OSC 2.1.0 version. ::
+
+    curl -X POST "http://localhost:8282/restconf/operations/A1-ADAPTER-API:putA1Policy"
+    -H "Content-Type: application/json" -d '{
+      "input": {
+        "near-rt-ric-url": "http://nearRtRic-sim1:8085/a1-p/policytypes/11/policies/5000",
+        "body": "{
+          "blocking_rate":20,
+          "enforce":true,
+          "trigger_threshold":10,
+          "window_length":10
+        }"
+      }
+    }'
+
+Create a policy in a Near |nbh| RT |nbsp| RIC that is using the STD 1.1.3 version. ::
+
+    curl -X POST http://localhost:8282/restconf/operations/A1-ADAPTER-API:putA1Policy
+    -H Content-Type:application/json -d '{
+      "input": {
+        "near-rt-ric-url": "http://ricsim_g2_1:8085/A1-P/v1/policies/5000",
+        "body": "{
+          "scope": {
+            "ueId": "ue5000",
+            "qosId": "qos5000"
+          },
+          "qosObjective": {
+            "priorityLevel": 5000
+          }
+        }"
+      }
+    }'
+
+**Result**:
+
+The result is the same irrespective of which API that is used.
+
+200: ::
+
+  {
+    "output": {
+      "http-status": 200
+    }
+  }
+
+Get Policy
+~~~~~~~~~~
+
+POST
+++++
+
+Gets a policy instance.
+
+Definition
+""""""""""
+
+**URL path:**
+
+/restconf/operations/A1-ADAPTER-API:getA1Policy
+
+**Parameters:**
+
+None.
+
+**Body:** (*Required*)
+
+A JSON object. ::
+
+  {
+    "input": {
+      "near-rt-ric-url": "<url-to-near-rt-ric-to-get-policy>"
+    }
+  }
+
+**Responses:**
+
+200:
+  A JSON object where the body tag contains the JSON object of the policy. ::
+
+    {
+      "output": {
+        "http-status": "integer",
+        "body": "{
+          <result>
+        }"
+      }
+    }
+
+Examples
+""""""""
+
+**Call**:
+
+Get **all** policy IDs from a Near |nbh| RT |nbsp| RIC that is using the OSC 2.1.0 version. ::
+
+    curl -X POST http://localhost:8282/restconf/operations/A1-ADAPTER-API:getA1Policy
+    -H Content-Type:application/json -d '{
+      "input": {
+        "near-rt-ric-url":"http://ricsim_g1_1:8085/a1-p/policytypes/11/policies"
+      }
+    }'
+
+Get **all** policy IDs from a Near |nbh| RT |nbsp| RIC that is using the STD 1.1.3 version. ::
+
+    curl -X POST http://localhost:8282/restconf/operations/A1-ADAPTER-API:getA1Policy
+    -H Content-Type:application/json -d '{
+      "input": {
+        "near-rt-ric-url":"http://ricsim_g2_1:8085/A1-P/v1/policies"
+      }
+    }'
+
+**Result**:
+
+The result is the same irrespective of which API that is used.
+
+200: ::
+
+  {
+    "output": {
+      "http-status":200,
+      "body":"[
+        \"5000\",
+          .
+          .
+          .
+        \"6000\"
+      ]"
+    }
+  }
+
+**Call**:
+
+Get **a specific** policy from a Near |nbh| RT |nbsp| RIC that is using the OSC 2.1.0 version. ::
+
+    curl -X POST "http://localhost:8282/restconf/operations/A1-ADAPTER-API:getA1Policy"
+    -H "Content-Type: application/json" -d '{
+      "input": {
+        "near-rt-ric-url": "http://nearRtRic-sim1:8085/a1-p/policytypes/11/policies/5000"
+      }
+    }'
+
+Get **a specific** policy from a Near |nbh| RT |nbsp| RIC that is using the STD 1.1.3 version. ::
+
+    curl -X POST http://localhost:8282/restconf/operations/A1-ADAPTER-API:getA1PolicyType
+    -H Content-Type:application/json -d '{
+      "input": {
+        "near-rt-ric-url":"http://ricsim_g2_1:8085/A1-P/v1/policies/5000"
+      }
+    }'
+
+**Result**:
+
+The result is the same irrespective of which API that is used.
+
+200: ::
+
+  {
+    "output": {
+      "http-status": 200,
+      "body": "{
+        \"blocking_rate\": 20,
+        \"enforce\": true,
+        \"trigger_threshold\": 10,
+        \"window_length\": 10
+      }"
+    }
+  }
+
+Delete Policy
+~~~~~~~~~~~~~
+
+POST
+++++
+
+Deletes a policy instance.
+
+Definition
+""""""""""
+
+**URL path:**
+
+/restconf/operations/A1-ADAPTER-API:deleteA1Policy
+
+**Parameters:**
+
+None.
+
+**Body:** (*Required*)
+
+A JSON object. ::
+
+  {
+    "input": {
+      "near-rt-ric-url": "<url-to-near-rt-ric-to-delete-policy>"
+    }
+  }
+
+**Responses:**
+
+200:
+
+A JSON object with the response. ::
+
+  {
+    "output": {
+      "http-status": "integer"
+    }
+  }
+
+Examples
+""""""""
+
+**Call**:
+
+Delete a policy from a Near |nbh| RT |nbsp| RIC that is using the OSC 2.1.0 version. ::
+
+    curl -X POST "http://localhost:8282/restconf/operations/A1-ADAPTER-API:deleteA1Policy"
+    -H "Content-Type: application/json" -d '{
+      "input": {
+        "near-rt-ric-url": "http://nearRtRic-sim1:8085/a1-p/policytypes/11/policies/5000"
+      }
+    }'
+
+Delete a policy from a Near |nbh| RT |nbsp| RIC that is using the STD 1.1.3 version. ::
+
+    curl -X POST "http://localhost:8282/restconf/operations/A1-ADAPTER-API:deleteA1Policy"
+    -H "Content-Type: application/json" -d '{
+      "input": {
+        "near-rt-ric-url": "http://ricsim_g2_1:8085/A1-P/v1/policies/5000"
+      }
+    }'
+
+**Result**:
+
+The result is the same irrespective of which API that is used.
+
+200: ::
+
+  {
+    "output": {
+      "http-status": 202
+    }
+  }
+
+Get Policy Status
+~~~~~~~~~~~~~~~~~
+
+POST
+++++
+
+Get the status of a policy instance.
+
+Definition
+""""""""""
+
+**URL path:**
+
+/restconf/operations/A1-ADAPTER-API:getA1PolicyStatus
+
+**Parameters:**
+
+None.
+
+**Body:** (*Required*)
+
+A JSON object. ::
+
+  {
+    "input": {
+      "near-rt-ric-url": "<url-to-near-rt-ric-to-get-policy-status>"
+    }
+  }
+
+**Responses:**
+
+200:
+
+A JSON object where the body tag contains the JSON object with the policy status according to the API version used. ::
+
+  {
+    "output": {
+      "http-status": "integer",
+      "body": "{
+        <policy-status-object>
+      }"
+    }
+  }
+
+Examples
+""""""""
+
+**Call**:
+
+Get the policy status for a specific policy from a Near |nbh| RT |nbsp| RIC that is using the OSC 2.1.0 version. ::
+
+    curl -X POST "http://localhost:8282/restconf/operations/A1-ADAPTER-API:getA1PolicyStatus"
+    -H "Content-Type: application/json" -d '{
+      "input": {
+        "near-rt-ric-url": "http://nearRtRic-sim1:8085/a1-p/policytypes/11/policies/5000/status"
+      }
+    }'
+
+**Result**:
+
+200: ::
+
+  {
+    "output": {
+      "http-status": 200,
+      "body": "{
+        \"instance_status\": \"IN EFFECT\",
+        \"has_been_deleted\": \"true\",
+        \"created_at\": \"Wed, 01 Apr 2020 07:45:45 GMT\"
+      }"
+    }
+  }
+
+**Call**:
+
+Get the policy status for a specific policy from a Near |nbh| RT |nbsp| RIC that is using the STD 1.1.3 version. ::
+
+    curl -X POST "http://localhost:8282/restconf/operations/A1-ADAPTER-API:getA1PolicyStatus"
+    -H "Content-Type: application/json" -d '{
+      "input": {
+        "near-rt-ric-url": "http://ricsim_g2_1:8085/A1-P/v1/policies/5000/status"
+      }
+    }'
+
+**Result**:
+
+200: ::
+
+  {
+    "output": {
+      "http-status": 200,
+      "body": "{
+        \"enforceStatus\": \"UNDEFINED\"
+      }"
+    }
+  }