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+API Link Procedures
+===================
+
+## getAllLinks
+
+- Purpose: **Get the list of possible relations between tasks**
+- Parameters: none
+- Result on success: **List of links**
+- Result on failure: **false**
+
+Request example:
+
+```json
+{
+    "jsonrpc": "2.0",
+    "method": "getAllLinks",
+    "id": 113057196
+}
+```
+
+Response example:
+
+```json
+{
+    "jsonrpc": "2.0",
+    "id": 113057196,
+    "result": [
+        {
+            "id": "1",
+            "label": "relates to",
+            "opposite_id": "0"
+        },
+        {
+            "id": "2",
+            "label": "blocks",
+            "opposite_id": "3"
+        },
+        {
+            "id": "3",
+            "label": "is blocked by",
+            "opposite_id": "2"
+        },
+        {
+            "id": "4",
+            "label": "duplicates",
+            "opposite_id": "5"
+        },
+        {
+            "id": "5",
+            "label": "is duplicated by",
+            "opposite_id": "4"
+        },
+        {
+            "id": "6",
+            "label": "is a child of",
+            "opposite_id": "7"
+        },
+        {
+            "id": "7",
+            "label": "is a parent of",
+            "opposite_id": "6"
+        },
+        {
+            "id": "8",
+            "label": "targets milestone",
+            "opposite_id": "9"
+        },
+        {
+            "id": "9",
+            "label": "is a milestone of",
+            "opposite_id": "8"
+        },
+        {
+            "id": "10",
+            "label": "fixes",
+            "opposite_id": "11"
+        },
+        {
+            "id": "11",
+            "label": "is fixed by",
+            "opposite_id": "10"
+        }
+    ]
+}
+```
+
+## getOppositeLinkId
+
+- Purpose: **Get the opposite link id of a task link**
+- Parameters:
+    - **link_id** (integer, required)
+- Result on success: **link_id**
+- Result on failure: **false**
+
+Request example:
+
+```json
+{
+    "jsonrpc": "2.0",
+    "method": "getOppositeLinkId",
+    "id": 407062448,
+    "params": [
+        2
+    ]
+}
+```
+
+Response example:
+
+```json
+{
+    "jsonrpc": "2.0",
+    "id": 407062448,
+    "result": "3"
+}
+```
+
+## getLinkByLabel
+
+- Purpose: **Get a link by label**
+- Parameters:
+    - **label** (integer, required)
+- Result on success: **link properties**
+- Result on failure: **false**
+
+Request example:
+
+```json
+{
+    "jsonrpc": "2.0",
+    "method": "getLinkByLabel",
+    "id": 1796123316,
+    "params": [
+        "blocks"
+    ]
+}
+```
+
+Response example:
+
+```json
+{
+    "jsonrpc": "2.0",
+    "id": 1796123316,
+    "result": {
+        "id": "2",
+        "label": "blocks",
+        "opposite_id": "3"
+    }
+}
+```
+
+## getLinkById
+
+- Purpose: **Get a link by id**
+- Parameters:
+    - **link_id** (integer, required)
+- Result on success: **link properties**
+- Result on failure: **false**
+
+Request example:
+
+```json
+{
+    "jsonrpc": "2.0",
+    "method": "getLinkById",
+    "id": 1190238402,
+    "params": [
+        4
+    ]
+}
+```
+
+Response example:
+
+```json
+{
+    "jsonrpc": "2.0",
+    "id": 1190238402,
+    "result": {
+        "id": "4",
+        "label": "duplicates",
+        "opposite_id": "5"
+    }
+}
+```
+
+## createLink
+
+- Purpose: **Create a new task relation**
+- Parameters:
+    - **label** (integer, required)
+    - **opposite_label** (integer, optional)
+- Result on success: **link_id**
+- Result on failure: **false**
+
+Request example:
+
+```json
+{
+    "jsonrpc": "2.0",
+    "method": "createLink",
+    "id": 1040237496,
+    "params": [
+        "foo",
+        "bar"
+    ]
+}
+```
+
+Response example:
+
+```json
+{
+    "jsonrpc": "2.0",
+    "id": 1040237496,
+    "result": 13
+}
+```
+
+## updateLink
+
+- Purpose: **Update a link**
+- Parameters:
+    - **link_id** (integer, required)
+    - **opposite_link_id** (integer, required)
+    - **label** (string, required)
+- Result on success: **true**
+- Result on failure: **false**
+
+Request example:
+
+```json
+{
+    "jsonrpc": "2.0",
+    "method": "updateLink",
+    "id": 2110446926,
+    "params": [
+        "14",
+        "12",
+        "boo"
+    ]
+}
+```
+
+Response example:
+
+```json
+{
+    "jsonrpc": "2.0",
+    "id": 2110446926,
+    "result": true
+}
+```
+
+## removeLink
+
+- Purpose: **Remove a link**
+- Parameters:
+    - **link_id** (integer, required)
+- Result on success: **true**
+- Result on failure: **false**
+
+Request example:
+
+```json
+{
+    "jsonrpc": "2.0",
+    "method": "removeLink",
+    "id": 2136522739,
+    "params": [
+        "14"
+    ]
+}
+```
+
+Response example:
+
+```json
+{
+    "jsonrpc": "2.0",
+    "id": 2136522739,
+    "result": true
+}
+```