Merge pull request #8269 from psollberger/main

Added guidance for Defined() usage

Author: Jak-MS

docs/extensibility/vsct-xml-schema-conditional-attributes.md

@@ -2,7 +2,7 @@
 title: VSCT XML Schema Conditional Attributes | Microsoft Docs
 description: Learn how to apply conditional attributes to VSCT XML schema lists and items. Attributes evaluate to true or false, controlling the resulting output.
 ms.custom: SEO-VS-2020
-ms.date: 11/04/2016
+ms.date: 07/13/2022
 ms.topic: reference
 helpviewer_keywords:
 - VSCT XML schema elements, conditional attributes
@@ -20,7 +20,7 @@ ms.workload:
  [!INCLUDE [Visual Studio](~/includes/applies-to-version/vs-windows-only.md)]
 You can apply conditional attributes to all lists and items. Logical operators and symbol expansion expressions evaluate to true or false. If true, the associated list or item is included in the resulting output.
 
- You can test token expansions against other token expansions or constants. The function `Defined()` tests whether a particular name has been defined, even if it has no value.
+ You can test token expansions against other token expansions or constants. The function `Defined()` tests whether a particular name has been defined, even if it has no value. To define a name, use the `VSCTDefinitions` property in your project file.
 
  When a Condition attribute is applied to a list, the condition is applied to every child element in the list. If a child element itself contains a Condition attribute, then its condition is combined with the parent expression by an AND operation.
 
@@ -39,6 +39,16 @@ You can apply conditional attributes to all lists and items. Logical operators a
 
 ## Examples
 
+### Project file
+
+```xml
+<PropertyGroup>
+    <VSCTDefinitions>DEMO_SKU</VSCTDefinitions>
+</PropertyGroup>
+```
+
+### VSCT file
+
 ```xml
 <Menu Condition="Defined(DEBUG)" ...
 </Menu>