added basic root event schema profile. (#58)

Author: RossBugginsNHS

cloudevents/schemas/digital-letters/2025-10/nhs-notify-digital-letters.schema.json

@@ -0,0 +1,52 @@
+{
+  "$id": "https://notify.nhs.uk/cloudevents/schemas/digital-letters/2025-10/nhs-notify-digital-letters.schema.json",
+  "$schema": "https://json-schema.org/draft/2020-12/schema",
+  "allOf": [
+    {
+      "$ref": "https://notify.nhs.uk/cloudevents/schemas/common/2025-10/nhs-notify-profile.schema.json"
+    }
+  ],
+  "description": "All events produced by Digital Letters ",
+  "properties": {
+    "profilepublished": {
+      "const": "2025-10",
+      "type": "string"
+    },
+    "profileversion": {
+      "const": "0.1.0",
+      "type": "string"
+    },
+    "source": {
+      "description": "Event source for digital letters.",
+      "examples": [
+        "/nhs/england/notify/production/primary/data-plane/digital-letters"
+      ],
+      "pattern": "^/nhs/england/notify/(production|staging|development|uat)/(primary|secondary|dev-[0-9]+)/data-plane/digital-letters$",
+      "type": "string"
+    },
+    "subject": {
+      "description": "Path in the form customer/{id}/order/{id}/item/{id} where each {{id}} is a UUID (xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx).",
+      "examples": [
+        "customer/920fca11-596a-4eca-9c47-99f624614658/order/769acdd4-6a47-496f-999f-76a6fd2c3959/item/4f5e17c0-ec57-4cee-9a86-14580cf5af7d"
+      ],
+      "pattern": "^customer/[0-9a-fA-F]{8}-[0-9a-fA-F]{4}-[0-9a-fA-F]{4}-[0-9a-fA-F]{4}-[0-9a-fA-F]{12}/order/[0-9a-fA-F]{8}-[0-9a-fA-F]{4}-[0-9a-fA-F]{4}-[0-9a-fA-F]{4}-[0-9a-fA-F]{12}/item/[0-9a-fA-F]{8}-[0-9a-fA-F]{4}-[0-9a-fA-F]{4}-[0-9a-fA-F]{4}-[0-9a-fA-F]{12}$",
+      "type": "string"
+    },
+    "type": {
+      "description": "Concrete versioned event type string for this example event (.vN suffix).",
+      "examples": [
+        "uk.nhs.notify.digital.letters.new.letter.v1"
+      ],
+      "pattern": "^uk\\.nhs\\.notify\\.digital\\.letters\\.[a-z0-9]+(?:\\.[a-z0-9]+)*\\.v[0-9]+$",
+      "type": "string"
+    }
+  },
+  "required": [
+    "type",
+    "source",
+    "subject",
+    "dataschema",
+    "data"
+  ],
+  "title": "NHS Notify Digtial Letters Events"
+}