UDT schema

.github/config/en-custom.txt

@@ -1296,4 +1296,7 @@ DaprConfigurationStoreProperties
 configurationStores
 configurationstores
 Oras
-oras
+oras
+apiVersions
+openAPI
+zA

docs/content/reference/resource-schema/udt/index.md

@@ -0,0 +1,100 @@
+---
+type: docs
+title: "User Defined Resource Type Schema"
+linkTitle: "User Defined Resource Type"
+description: "Schema reference document for a User defined Resource Type"
+categories: "Schema"
+weight: 100
+---
+
+## Overview
+
+Radius supports creation of user defined types, which have an user defined schema. 
+These types can be managed using [rad resource-type](docs/content/reference/cli/rad_resource-type.md) command. 
+
+##  Schema Format
+
+{{< tabs "Resource Manifest" >}}
+
+{{< codetab >}}
+
+{{< rad file="snippets/postgres.yaml" embed=true marker="//SAMPLE" >}}
+
+{{< /codetab >}}
+
+{{< /tabs >}}
+
+## Top-level
+
+Manifest file has below keys at the top level:
+
+| Key | Required | Description | Example |
+|-----|----------|---------|---------|
+| **name** | yes | The namespace in which the resource type is registered | `MyCompany.Resources` | 
+| [**types**](#types) | yes | type names in the specified namespace. The resource type manifest usually has one type that should be registered. | `postgresDatabases` | 
+
+### types
+
+| Key | Required | Description | Example | 
+|-----|-------------|---------|-----------|
+| [**resource type name**](#resource-type-name) | yes | The namespace in which the resource type is registered | `MyCompany.Resources` | 
+
+## resource type name
+
+| Key | Required | Description | Example | 
+|-----|-------------|---------|
+| **description** | yes | Description of the resource type | `A postgreSQL database` | 
+| [**apiVersions**](#apiVersions) | yes | api versions which support this resource type | `2025-01-01-preview` | 
+
+## apiVersions
+
+| Key | Required |Description | Example | 
+|-----|-------------|---------|
+| [**api version name**](#api-version-name) | yes | a specific api version which supports this resource type | `2025-01-01-preview` | 
+
+## api version name
+
+| Key | Required | Description |
+|-----|-------------|----------|
+| [**schema**](#schema) | yes | openAPI v3 structural schema of the resource type in a specific api version. Radius supports a subset of open API capabilities. This is covered in subsequent sections  | 
+
+## schema
+
+`schema` holds the description of the structural schema for new resource type use using [Open API v3](https://github.com/OAI/OpenAPI-Specification/blob/main/versions/3.0.2.md#schema-object)
+
+| Key | Required | Description | 
+|-----|-------------|------------|
+| **type**| yes | type of `schema`. This is always `object`, representing a open API v3 object  | 
+| [**properties**](#properties)| yes | properties which are valid for a resource of the specified resource type| 
+
+### properties
+
+| Key | Required | Description | Example | 
+|-----|-------------|---------|----------|
+| [**property name**](#property-name)| yes | A property name. Property names MUST be strings and SHOULD conform to the regular expression: ^[a-zA-Z0-9\.\-_]+$.| logging-verbosity | 
+
+### property name
+
+| Key | Required | Description | Example | 
+|-----|-------------|---------|----------|
+| **type** | yes | type of the value of property. This can be `integer`, `number`, `string` or `boolean` | `true` |
+| **description** | no | description of the property | "The size of database to provision" | 
+
+
+#### example
+
+```
+    properties:
+      host:
+        type: string
+        description: hostname
+      port:
+        type: integer
+        description: server listening port
+      cost:
+        type: number
+        description: cost till date 
+      shared:
+        type: boolean
+        description: is this resource shared between different applications
+```

docs/content/reference/resource-schema/udt/snippets/postgres.yaml

@@ -0,0 +1,37 @@
+name: MyCompany.Resources
+types:
+  postgresDatabases:
+    description: A postgreSQL database
+    apiVersions:
+      '2023-10-01-preview':
+        schema: 
+          type: object
+          properties:
+            environment:
+              type: string
+            application:
+              type: string
+              description: The resource ID of the application.
+            status:
+              type: object
+              properties:
+                binding:
+                  type: object
+                  properties:
+                    database:
+                      type: string
+                      description: The name of the database.
+                    host:
+                      type: string
+                      description: The host name of the database.
+                    port:
+                      type: string
+                      description: The port number of the database.
+                    username:
+                      type: string
+                      description: The username for the database.
+                    password:
+                      type: string
+                      description: The password for the database.
+    capabilities: ["SupportsRecipes"]
+