diff --git a/meta/applicator.json b/meta/applicator.json
index 53645d60..ff2cfc2f 100644
--- a/meta/applicator.json
+++ b/meta/applicator.json
@@ -12,7 +12,10 @@
         "prefixItems": { "$ref": "#/$defs/schemaArray" },
         "items": { "$dynamicRef": "#meta" },
         "contains": { "$dynamicRef": "#meta" },
-        "additionalProperties": { "$dynamicRef": "#meta" },
+        "additionalProperties": {
+            "$dynamicRef": "#meta",
+            "default": {}
+        },
         "properties": {
             "type": "object",
             "additionalProperties": { "$dynamicRef": "#meta" },
@@ -26,11 +29,13 @@
         },
         "dependentSchemas": {
             "type": "object",
-            "additionalProperties": {
-                "$dynamicRef": "#meta"
-            }
+            "additionalProperties": { "$dynamicRef": "#meta" },
+            "default": {}
+        },
+        "propertyNames": { 
+            "$dynamicRef": "#meta",
+            "default": {}
         },
-        "propertyNames": { "$dynamicRef": "#meta" },
         "if": { "$dynamicRef": "#meta" },
         "then": { "$dynamicRef": "#meta" },
         "else": { "$dynamicRef": "#meta" },
diff --git a/meta/content.json b/meta/content.json
index fc39a966..2f6e056a 100644
--- a/meta/content.json
+++ b/meta/content.json
@@ -10,8 +10,8 @@
 
     "type": ["object", "boolean"],
     "properties": {
-        "contentMediaType": { "type": "string" },
         "contentEncoding": { "type": "string" },
+        "contentMediaType": { "type": "string" },
         "contentSchema": { "$dynamicRef": "#meta" }
     }
 }
diff --git a/meta/core.json b/meta/core.json
index e87bd3ec..7b5758b1 100644
--- a/meta/core.json
+++ b/meta/core.json
@@ -10,37 +10,18 @@
     "type": ["object", "boolean"],
     "properties": {
         "$id": {
-            "type": "string",
-            "format": "uri-reference",
+            "$ref": "#/$defs/uriReferenceString",
             "$comment": "Non-empty fragments not allowed.",
             "pattern": "^[^#]*#?$"
         },
-        "$schema": {
-            "type": "string",
-            "format": "uri"
-        },
-        "$anchor": {
-            "type": "string",
-            "pattern": "^[A-Za-z_][-A-Za-z0-9._]*$"
-        },
-        "$ref": {
-            "type": "string",
-            "format": "uri-reference"
-        },
-        "$dynamicRef": {
-            "type": "string",
-            "format": "uri-reference"
-        },
-        "$dynamicAnchor": {
-            "type": "string",
-            "pattern": "^[A-Za-z_][-A-Za-z0-9._]*$"
-        },
+        "$schema": { "$ref": "#/$defs/uriString" },
+        "$ref": { "$ref": "#/$defs/uriReferenceString" },
+        "$anchor": { "$ref": "#/$defs/anchorString" },
+        "$dynamicRef": { "$ref": "#/$defs/uriReferenceString" },
+        "$dynamicAnchor": { "$ref": "#/$defs/anchorString" },
         "$vocabulary": {
             "type": "object",
-            "propertyNames": {
-                "type": "string",
-                "format": "uri"
-            },
+            "propertyNames": { "$ref": "#/$defs/uriString" },
             "additionalProperties": {
                 "type": "boolean"
             }
@@ -53,5 +34,19 @@
             "additionalProperties": { "$dynamicRef": "#meta" },
             "default": {}
         }
+    },
+    "$defs": {
+        "anchorString": {
+            "type": "string",
+            "pattern": "^[A-Za-z_][-A-Za-z0-9._]*$"
+        },
+        "uriString": {
+            "type": "string",
+            "format": "uri"
+        },
+        "uriReferenceString": {
+            "type": "string",
+            "format": "uri-reference"
+        }
     }
 }
diff --git a/meta/validation.json b/meta/validation.json
index edb4a301..606b87ba 100644
--- a/meta/validation.json
+++ b/meta/validation.json
@@ -9,6 +9,22 @@
     "title": "Validation vocabulary meta-schema",
     "type": ["object", "boolean"],
     "properties": {
+        "type": {
+            "anyOf": [
+                { "$ref": "#/$defs/simpleTypes" },
+                {
+                    "type": "array",
+                    "items": { "$ref": "#/$defs/simpleTypes" },
+                    "minItems": 1,
+                    "uniqueItems": true
+                }
+            ]
+        },
+        "const": true,
+        "enum": {
+            "type": "array",
+            "items": true
+        },
         "multipleOf": {
             "type": "number",
             "exclusiveMinimum": 0
@@ -50,22 +66,6 @@
             "additionalProperties": {
                 "$ref": "#/$defs/stringArray"
             }
-        },
-        "const": true,
-        "enum": {
-            "type": "array",
-            "items": true
-        },
-        "type": {
-            "anyOf": [
-                { "$ref": "#/$defs/simpleTypes" },
-                {
-                    "type": "array",
-                    "items": { "$ref": "#/$defs/simpleTypes" },
-                    "minItems": 1,
-                    "uniqueItems": true
-                }
-            ]
         }
     },
     "$defs": {
diff --git a/schema.json b/schema.json
index 9235df28..ca910847 100644
--- a/schema.json
+++ b/schema.json
@@ -22,22 +22,35 @@
         {"$ref": "meta/content"}
     ],
     "type": ["object", "boolean"],
+    "$comment": "This meta-schema also defines keywords that have appeared in previous drafts in order to prevent incompatible extensions as they remain in common use.",
     "properties": {
         "definitions": {
-            "$comment": "While no longer an official keyword as it is replaced by $defs, this keyword is retained in the meta-schema to prevent incompatible extensions as it remains in common use.",
+            "$comment": "\"definitions\" has been replaced by \"$defs\".",
             "type": "object",
             "additionalProperties": { "$dynamicRef": "#meta" },
-            "default": {}
+            "default": {},
+            "deprecated": true
         },
         "dependencies": {
-            "$comment": "\"dependencies\" is no longer a keyword, but schema authors should avoid redefining it to facilitate a smooth transition to \"dependentSchemas\" and \"dependentRequired\"",
+            "$comment": "\"dependencies\" has been split and replaced by \"dependentSchemas\" and \"dependentRequired\" in order to serve their differing semantics.",
             "type": "object",
             "additionalProperties": {
                 "anyOf": [
                     { "$dynamicRef": "#meta" },
                     { "$ref": "meta/validation#/$defs/stringArray" }
                 ]
-            }
+            },
+            "deprecated": true
+        },
+        "$recursiveAnchor": {
+            "$comment": "\"$recursiveAnchor\" has been replaced by \"$dynamicAnchor\".",
+            "$ref": "meta/core#/$defs/anchorString",
+            "deprecated": true
+        },
+        "$recursiveRef": {
+            "$comment": "\"$recursiveRef\" has been replaced by \"$dynamicRef\".",
+            "$ref": "meta/core#/$defs/uriReferenceString",
+            "deprecated": true
         }
     }
 }