Updated article

Author: eshanrnh

15/umbraco-cms/reference/querying/udi-identifiers.md

@@ -1,33 +1,80 @@
 # UDI Identifiers
 
-## Introduction
+Umbraco uses Unique Document Identifiers (UDIs) to reference most object types, such as content, media, and members. A UDI contains all the metadata needed to retrieve an Umbraco object and is readable within text.
 
-Umbraco stores identifiers in UDI format for most Umbraco object types. This identifier stores all of the metadata required to retrieve an Umbraco object and is parse-able within text. Example: `umb://document/4fed18d8c5e34d5e88cfff3a5b457bf2`. UDI's can be used in many of the querying APIs.
+Example:
 
-{% hint style="info" %}
-UDI is currently not an acronym for something. There is no official definition of what it's short for. Therefore it's called *UDI*
-{% endhint %}
+```text
+umb://document/4fed18d8c5e34d5e88cfff3a5b457bf2. 
+```
 
-## Format
+UDIs are commonly used in Umbraco’s querying and management APIs.
 
-An Umbraco UDI consists of three parts: the scheme, the type and a GUID Identifier. For example: `umb://document/4fed18d8c5e34d5e88cfff3a5b457bf2`.
+## Format
 
-Breaking it down:
+A UDI consists of three parts:
 
-1. The scheme is `umb://` - this is always the same and makes it identifiable as an Umbraco UDI
-2. The type is `document` - so in this is an Umbraco node, but it could also be `media`, `member`, etc.
-3. The GUID Id is `4fed18d8c5e34d5e88cfff3a5b457bf2` - this is a GUID (dashes removed) which is randomly generated when the item is being created
+1. Scheme: `umb://` – Identifies as an Umbraco UDI.
+2. Type: `document`– Specifies the object type (for example, media, member, Data Type, and so on).
+3. GUID Identifier: `4fed18d8c5e34d5e88cfff3a5b457bf2` – A unique identifier for the object (a GUID without dashes).
 
 ## Usage
 
-You can use UDIs in some of the Querying and Management/Service APIs.
+UDIs are useful for retrieving content, media, or other Umbraco objects through the API. Below are examples of how to use a UDI in C# to get content or media.
+
+### Retrieving Content by UDI
+
+You can retrieve a content item using `IContentService`:
+
+```cs
+using Umbraco.Cms.Core.Services;
+using Umbraco.Cms.Core.Models
+
+@inject IContentService contentService
+
+@{
+   // Define the UDI string here
+    var udiString = "umb://document/334cadfa62dd49049aad86b6e4c02aac"; // Example UDI string
+
+   if (udiString.StartsWith("umb://document/"))
+    {
+        // Extract the GUID from the UDI string
+        var guidString = udiString.Replace("umb://document/", "");
+        if (Guid.TryParse(guidString, out var guid))
+        {
+            // Retrieve the content by GUID
+            var content = contentService.GetById(guid);
+            if (content != null)
+            {
+                // Access the body text field
+                var bodyText = content.GetValue<string>("bodyText"); // Replace 'bodyText' with the alias of your body text field
+                <p>@bodyText</p>  // Output the body text
+            }
+        else
+            {
+                <p>Content not found.</p>
+            }
+        }
+        else
+        {
+            <p>Invalid GUID in the UDI string.</p>
+        }
+    }
+}
+```
+
+## UDI Types
+
+There are two types of UDIs in Umbraco:
+
+### GUID UDI
 
-There are 2 types of UDIs:
+Used for objects that have a GUID identifier, such as content and media.
 
-## GUID UDI
+* [API Reference: GuidUdi](https://apidocs.umbraco.com/v15/csharp/api/Umbraco.Cms.Core.GuidUdi.html)
 
-* [API Reference](https://apidocs.umbraco.com/v15/csharp/api/Umbraco.Cms.Core.GuidUdi.html)
+### String UDI
 
-## String UDI
+Used for objects that are not GUID-based, such as dictionary items.
 
-* [API Reference](https://apidocs.umbraco.com/v15/csharp/api/Umbraco.Cms.Core.StringUdi.html)
+* [API Reference: StringUdi](https://apidocs.umbraco.com/v15/csharp/api/Umbraco.Cms.Core.StringUdi.html)