Add event examples and address review comments

Signed-off-by: jpcshka <189279532+jpcshka@users.noreply.github.com>

content/client-server-api/modules/image_packs.md

@@ -57,6 +57,8 @@ when creating or editing image packs.
 
 {{% event event="m.room.image_pack" %}}
 
+#### Account data
+
 {{% event event="m.image_pack.rooms" %}}
 
 #### Image properties
@@ -82,6 +84,22 @@ To make a room's image pack available globally across all rooms, a user adds
 a reference to the pack in their `m.image_pack.rooms` account data event. The
 reference consists of the room ID and the `state_key` of the pack.
 
+For example, to enable two packs from different rooms:
+
+```json
+{
+  "rooms": {
+    "!someroom:example.org": {
+      "": {}
+    },
+    "!anotherroom:example.org": {
+      "": {},
+      "sticker_pack": {}
+    }
+  }
+}
+```
+
 #### Space image packs
 
 Clients SHOULD surface image packs defined in the canonical space of the

data/event-schemas/examples/m.image_pack.rooms.yaml

@@ -0,0 +1,15 @@
+{
+  "$ref": "core/event.json",
+  "type": "m.image_pack.rooms",
+  "content": {
+    "rooms": {
+      "!someroom:example.org": {
+        "": {}
+      },
+      "!anotherroom:example.org": {
+        "": {},
+        "sticker_pack": {}
+      }
+    }
+  }
+}

data/event-schemas/examples/m.room.image_pack.yaml

@@ -0,0 +1,29 @@
+{
+  "$ref": "core/state_event.json",
+  "type": "m.room.image_pack",
+  "state_key": "",
+  "content": {
+    "images": {
+      "cat_wave": {
+        "url": "mxc://example.org/abc123",
+        "body": "a waving cat",
+        "info": {
+          "mimetype": "image/png",
+          "w": 512,
+          "h": 512,
+          "size": 84400
+        }
+      },
+      "cat_nap": {
+        "url": "mxc://example.org/def456",
+        "body": "a sleeping cat"
+      }
+    },
+    "pack": {
+      "display_name": "Cats",
+      "avatar_url": "mxc://example.org/abc123",
+      "usage": ["emoticon"],
+      "attribution": "drawn by @alice:example.org"
+    }
+  }
+}

data/event-schemas/schema/m.room.image_pack.yaml

@@ -18,6 +18,9 @@ properties:
           A map from a [shortcode](#shortcode-grammar) to an image object.
           Each entry defines one image available in this pack.
         type: object
+        propertyNames:
+          type: string
+          pattern: '^[A-Za-z0-9_-]{1,100}$'
         additionalProperties:
           title: ImagePackImage
           type: object