diff --git a/.github/workflows/validate-json.yaml b/.github/workflows/validate-json.yaml
index 789d87a..b53a482 100644
--- a/.github/workflows/validate-json.yaml
+++ b/.github/workflows/validate-json.yaml
@@ -19,14 +19,14 @@ jobs:
         
     - name: Lint JSON files
       run: |
-        echo "Linting softbinding-algorithm-entry-schema.json..."
+        echo "Linting softbinding-algorithm-list.schema.json..."
         set -e  # Exit on any error
-        jsonschema lint softbinding-algorithm-entry-schema.json
-        echo "✓ softbinding-algorithm-entry-schema.json passed linting"
+        jsonschema lint softbinding-algorithm-list.schema.json
+        echo "✓ softbinding-algorithm-list.schema.json passed linting"
         
     - name: Validate against schema
       run: |
         echo "Validating softbinding-algorithm-list.json against schema..."
         set -e  # Exit on any error
-        jsonschema validate softbinding-algorithm-entry-schema.json softbinding-algorithm-list.json 
-        echo "✓ softbinding-algorithm-list.json is valid against the schema"
\ No newline at end of file
+        jsonschema validate softbinding-algorithm-list.schema.json softbinding-algorithm-list.json 
+        echo "✓ softbinding-algorithm-list.json is valid against the schema"
diff --git a/softbinding-algorithm-entry-schema.json b/softbinding-algorithm-list.schema.json
similarity index 75%
rename from softbinding-algorithm-entry-schema.json
rename to softbinding-algorithm-list.schema.json
index 12bbbc6..021f227 100644
--- a/softbinding-algorithm-entry-schema.json
+++ b/softbinding-algorithm-list.schema.json
@@ -18,7 +18,7 @@
             },
             "alg": {
                 "type": "string",
-                "pattern": "(c2pa\\.|[A-Za-z0-9\\-\\.]+)",
+                "pattern": "^[A-Za-z]{2,63}(?:\\.[A-Za-z0-9](?:[A-Za-z0-9-]*[A-Za-z0-9])?)+\\.?$",
                 "description": "Entity-specific namespace as specified for C2PA Assertions labels that shall begin with the Internet domain name for the entity similar to how Java packages are defined (e.g., `com.example.algo1`, `net.example.algos.algo2`)"
             },
             "type": {
@@ -59,6 +59,14 @@
                         "type": "string",
                         "description": "Human readable description of the algorithm."
                     },
+                    "categories": {
+                        "type": "array",
+                        "description": "This allows specifying values that can be used to cluster this algorithm with others of the same or similar values. For example an algorithm that is used in a certain context (e.g., verified news, advertising). The format of these categories follows the entity-specific namespace as specified for C2PA Assertions labels that shall begin with the (reversed) Internet domain name for the entity similar to how Java packages are defined (e.g., `org.iptc.watermarking`, `net.example.cluster.context1`)",
+                        "items": {
+                            "type": "string",
+                            "pattern": "^[A-Za-z]{2,63}(?:\\.[A-Za-z0-9](?:[A-Za-z0-9-]*[A-Za-z0-9])?)+\\.?$"
+                        }
+                    },
                     "dateEntered": {
                         "type": "string",
                         "format": "date-time",
@@ -90,25 +98,33 @@
                 "description": "A list of Soft Binding Resolution APIs supporting this algorithm."
             }
         },
+        "required": [
+            "identifier",
+            "alg",
+            "type",
+            "entryMetadata"
+        ],
         "oneOf": [
             {
-                "required": ["decodedMediaTypes"],
+                "required": [
+                    "decodedMediaTypes"
+                ],
                 "not": {
-                    "required": ["encodedMediaTypes"]
+                    "required": [
+                        "encodedMediaTypes"
+                    ]
                 }
             },
             {
-                "required": ["encodedMediaTypes"],
+                "required": [
+                    "encodedMediaTypes"
+                ],
                 "not": {
-                    "required": ["decodedMediaTypes"]
+                    "required": [
+                        "decodedMediaTypes"
+                    ]
                 }
             }
-        ],
-        "required": [
-            "identifier",
-            "alg",
-            "type",
-            "entryMetadata"
         ]
     }
-}
\ No newline at end of file
+}