diff --git a/schemas/links/embeddedlinkend.json b/schemas/links/embeddedlinkend.json
index f9a4bf4..6a94ac6 100644
--- a/schemas/links/embeddedlinkend.json
+++ b/schemas/links/embeddedlinkend.json
@@ -1,24 +1,30 @@
 {
   "$schema": "https://json-schema.org/draft/2020-12/schema",
   "$id": "https://cdevents.dev/0.6.0-draft/schema/links/embeddedlinkend",
+  "type": "object",
+  "additionalProperties": false,
   "properties": {
     "linkType": {
       "type": "string",
-      "enum": [
-        "END"
-      ]
+      "enum": ["END"]
     },
     "from": {
-      "description": "When consuming a CDEvent, you are consuming a parent event. So, when looking at the 'from' key, this is the parent's parent.",
+      "description": "Identifies the upstream entity of the END link. May reference a CDEvent context ID, a domain execution ID, or both.",
       "type": "object",
+      "additionalProperties": false,
       "properties": {
         "contextId": {
           "type": "string",
           "minLength": 1
+        },
+        "domainId": {
+          "type": "string",
+          "minLength": 1
         }
       },
-      "required": [
-        "contextId"
+      "anyOf": [
+        { "required": ["contextId"] },
+        { "required": ["domainId"] }
       ]
     },
     "tags": {
@@ -26,8 +32,6 @@
       "additionalProperties": true
     }
   },
-  "additionalProperties": false,
-  "type": "object",
   "required": [
     "linkType"
   ]
diff --git a/schemas/links/embeddedlinkpath.json b/schemas/links/embeddedlinkpath.json
index d783aa4..41fa4d8 100644
--- a/schemas/links/embeddedlinkpath.json
+++ b/schemas/links/embeddedlinkpath.json
@@ -1,24 +1,30 @@
 {
   "$schema": "https://json-schema.org/draft/2020-12/schema",
   "$id": "https://cdevents.dev/0.6.0-draft/schema/links/embeddedlinkpath",
+  "type": "object",
+  "additionalProperties": false,
   "properties": {
     "linkType": {
       "type": "string",
-      "enum": [
-        "PATH"
-      ]
+      "enum": ["PATH"]
     },
     "from": {
-      "description": "When consuming a CDEvent, you are consuming a parent event. So, when looking at the 'from' key, this is the parent's parent.",
+      "description": "Identifies the upstream parent in the path. May reference a CDEvent context ID, a domain execution ID, or both.",
       "type": "object",
+      "additionalProperties": false,
       "properties": {
         "contextId": {
           "type": "string",
           "minLength": 1
+        },
+        "domainId": {
+          "type": "string",
+          "minLength": 1
         }
       },
-      "required": [
-        "contextId"
+      "anyOf": [
+        { "required": ["contextId"] },
+        { "required": ["domainId"] }
       ]
     },
     "tags": {
@@ -26,10 +32,9 @@
       "additionalProperties": true
     }
   },
-  "additionalProperties": false,
-  "type": "object",
   "required": [
     "linkType",
     "from"
   ]
 }
+
diff --git a/schemas/links/embeddedlinkrelation.json b/schemas/links/embeddedlinkrelation.json
index aa5d438..5b4de33 100644
--- a/schemas/links/embeddedlinkrelation.json
+++ b/schemas/links/embeddedlinkrelation.json
@@ -1,34 +1,41 @@
 {
   "$schema": "https://json-schema.org/draft/2020-12/schema",
   "$id": "https://cdevents.dev/0.6.0-draft/schema/links/embeddedlinkrelation",
+  "type": "object",
+  "additionalProperties": false,
   "properties": {
     "linkType": {
       "type": "string",
-      "enum": [
-        "RELATION"
-      ]
+      "enum": ["RELATION"]
     },
     "linkKind": {
       "type": "string",
       "minLength": 1
     },
     "target": {
-      "description": "",
+      "description": "Identifies the target of the relation. May reference a CDEvent context ID, a domain execution ID, or both.",
       "type": "object",
+      "additionalProperties": false,
       "properties": {
         "contextId": {
           "type": "string",
           "minLength": 1
+        },
+        "domainId": {
+          "type": "string",
+          "minLength": 1
         }
-      }
+      },
+      "anyOf": [
+        { "required": ["contextId"] },
+        { "required": ["domainId"] }
+      ]
     },
     "tags": {
       "type": "object",
       "additionalProperties": true
     }
   },
-  "additionalProperties": false,
-  "type": "object",
   "required": [
     "linkType",
     "linkKind",
diff --git a/schemas/links/linkend.json b/schemas/links/linkend.json
index 6bc3904..cc79826 100644
--- a/schemas/links/linkend.json
+++ b/schemas/links/linkend.json
@@ -1,47 +1,59 @@
 {
   "$schema": "https://json-schema.org/draft/2020-12/schema",
   "$id": "https://cdevents.dev/0.6.0-draft/schema/links/linkend",
+  "type": "object",
+  "additionalProperties": false,
   "properties": {
     "chainId": {
-      "description": "This represents the full lifecycles of a series of events in CDEvents",
+      "description": "Represents the lifecycle grouping of a series of related events.",
       "type": "string",
       "minLength": 1
     },
     "linkType": {
-      "description": "The type associated with the link. In this case, 'END', suggesting the end of some CI/CD lifecycle",
+      "description": "The type associated with the link. In this case, 'END', suggesting the end of some CI/CD lifecycle.",
       "type": "string",
-      "enum": [
-        "END"
-      ]
+      "enum": ["END"]
     },
     "timestamp": {
       "type": "string",
       "format": "date-time"
     },
     "from": {
-      "description": "This is the context ID of the producing CDEvent.",
+      "description": "Identifies the producing entity of the END link. May reference a CDEvent context ID, a domain execution ID, or both.",
       "type": "object",
+      "additionalProperties": false,
       "properties": {
         "contextId": {
           "type": "string",
           "minLength": 1
+        },
+        "domainId": {
+          "type": "string",
+          "minLength": 1
         }
       },
-      "required": [
-        "contextId"
+      "anyOf": [
+        { "required": ["contextId"] },
+        { "required": ["domainId"] }
       ]
     },
     "end": {
-      "description": "This is the context ID of the final CDEvent in the chain",
+      "description": "Identifies the final entity in the lifecycle. May reference a CDEvent context ID, a domain execution ID, or both.",
       "type": "object",
+      "additionalProperties": false,
       "properties": {
         "contextId": {
           "type": "string",
           "minLength": 1
+        },
+        "domainId": {
+          "type": "string",
+          "minLength": 1
         }
       },
-      "required": [
-        "contextId"
+      "anyOf": [
+        { "required": ["contextId"] },
+        { "required": ["domainId"] }
       ]
     },
     "tags": {
@@ -49,10 +61,7 @@
       "additionalProperties": true
     }
   },
-  "additionalProperties": false,
-  "type": "object",
   "required": [
-    "chainId",
     "linkType",
     "timestamp",
     "from",
diff --git a/schemas/links/linkrelation.json b/schemas/links/linkrelation.json
index d597264..9890eb4 100644
--- a/schemas/links/linkrelation.json
+++ b/schemas/links/linkrelation.json
@@ -1,17 +1,17 @@
 {
   "$schema": "https://json-schema.org/draft/2020-12/schema",
   "$id": "https://cdevents.dev/0.6.0-draft/schema/links/linkrelation",
+  "type": "object",
+  "additionalProperties": false,
   "properties": {
     "chainId": {
-      "description": "This represents the full lifecycles of a series of events in CDEvents",
+      "description": "Represents the lifecycle grouping of a series of related events.",
       "type": "string",
       "minLength": 1
     },
     "linkType": {
       "type": "string",
-      "enum": [
-        "RELATION"
-      ]
+      "enum": ["RELATION"]
     },
     "linkKind": {
       "type": "string",
@@ -22,29 +22,41 @@
       "format": "date-time"
     },
     "source": {
-      "description": "",
+      "description": "Identifies the source of the relation. May reference a CDEvent context ID, a domain execution ID, or both.",
       "type": "object",
+      "additionalProperties": false,
       "properties": {
         "contextId": {
           "type": "string",
           "minLength": 1
+        },
+        "domainId": {
+          "type": "string",
+          "minLength": 1
         }
       },
-      "required": [
-        "contextId"
+      "anyOf": [
+        { "required": ["contextId"] },
+        { "required": ["domainId"] }
       ]
     },
     "target": {
-      "description": "",
+      "description": "Identifies the target of the relation. May reference a CDEvent context ID, a domain execution ID, or both.",
       "type": "object",
+      "additionalProperties": false,
       "properties": {
         "contextId": {
           "type": "string",
           "minLength": 1
+        },
+        "domainId": {
+          "type": "string",
+          "minLength": 1
         }
       },
-      "required": [
-        "contextId"
+      "anyOf": [
+        { "required": ["contextId"] },
+        { "required": ["domainId"] }
       ]
     },
     "tags": {
@@ -52,13 +64,11 @@
       "additionalProperties": true
     }
   },
-  "additionalProperties": false,
-  "type": "object",
   "required": [
-    "chainId",
     "linkType",
     "timestamp",
     "source",
     "target"
   ]
 }
+
diff --git a/schemas/links/linkstart.json b/schemas/links/linkstart.json
index 1a60021..b6572d5 100644
--- a/schemas/links/linkstart.json
+++ b/schemas/links/linkstart.json
@@ -1,34 +1,40 @@
 {
   "$schema": "https://json-schema.org/draft/2020-12/schema",
   "$id": "https://cdevents.dev/0.6.0-draft/schema/links/linkstart",
+  "type": "object",
+  "additionalProperties": false,
   "properties": {
     "chainId": {
-      "description": "This represents the full lifecycles of a series of events in CDEvents",
+      "description": "Represents the lifecycle grouping of a series of related events.",
       "type": "string",
       "minLength": 1
     },
     "linkType": {
-      "description": "The type associated with the link. In this case, 'START', suggesting the start of some CI/CD lifecycle",
+      "description": "The type associated with the link. In this case, 'START', suggesting the start of some lifecycle.",
       "type": "string",
-      "enum": [
-        "START"
-      ]
+      "enum": ["START"]
     },
     "timestamp": {
       "type": "string",
       "format": "date-time"
     },
     "start": {
-      "description": "This is the context ID of the starting CDEvent in the chain.",
+      "description": "Identifies the starting point of the link. May reference a CDEvent context ID, a domain execution ID, or both.",
       "type": "object",
+      "additionalProperties": false,
       "properties": {
         "contextId": {
           "type": "string",
           "minLength": 1
+        },
+        "domainId": {
+          "type": "string",
+          "minLength": 1
         }
       },
-      "required": [
-        "contextId"
+      "anyOf": [
+        { "required": ["contextId"] },
+        { "required": ["domainId"] }
       ]
     },
     "tags": {
@@ -36,12 +42,10 @@
       "additionalProperties": true
     }
   },
-  "additionalProperties": false,
-  "type": "object",
   "required": [
-    "chainId",
     "linkType",
     "timestamp",
     "start"
   ]
 }
+