update: add example

schema/system/iframe_message.json

@@ -3,6 +3,29 @@
     "$schema": "http://json-schema.org/draft-07/schema#",
     "title": "iframe message schema",
     "description": "communication message between iframe and the parent window.",
+    "examples": [
+        {
+            "type": "from-iframe-to-host",
+            "action": "set-data",
+            "payload": {
+                "material": {"name": "material1", "lattice": "material", "basis": "data1"}
+            }
+        },
+        {
+            "type": "from-host-to-iframe",
+            "action": "get-data",
+            "payload": {
+                "key": "value"
+            }
+        },
+        {
+            "type": "from-iframe-to-host",
+            "action": "info",
+            "payload": {
+                "status": "ready"
+            }
+        }
+    ],
     "type": "object",
     "properties": {
         "type": {