Merge pull request #336 from microsoft/graph

New Graph patterns: change tracking, evolvable enums, and namespace

Author: OlgaPodo

graph/GuidelinesGraph.md

@@ -414,8 +414,11 @@ Recommended API Design patterns:
 | Type Hierarchy          | The ability to model is-a relationships using subtypes.                                | [Subtypes](./patterns/Modelling%20with%20Subtypes%20Pattern.md) |
 | Facets         | The ability to model parent-child relationships using Facet pattern.                                | [Facets](./patterns/Modelling%20with%20Subtypes%20Pattern.md) |
 | Dictionary          | The ability for clients to provide an unknown quantity of data elements of the same type.       | [Dictionary](./patterns/dictionary.md) |
+| Evolvable Enums     | The ability to extend enumerated types without breaking changes.       | [Evolvable Enums](./patterns/evolvable-enums.md) |
+| Change Tracking     | The ability to keep API consumers in sync with changes without polling.       | [Change Tracking](./patterns/change-tracking.md) |
+| Namespace     | The ability to organize resource definitions into a logical set.     | [Namespace](./patterns/namespace.md) |
 
-                                                                     |
+                                                                    |
 
 
 ## References

graph/SummaryOfGraphDeltas.md

@@ -16,22 +16,21 @@ to annotate any usages of that type.
 
 **Example of property annotation:**
 
-~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
- <EntityType Name="outlookTask" BaseType="Microsoft.OutlookServices.outlookItem" ags:IsMaster="true" ags:WorkloadName="Task" ags:EnabledForPassthrough="true">
-    <Annotation Term="Org.OData.Core.V1.Revisions">
-      <Collection>
-        <Record>
-          <PropertyValue Property = "Date" Date="2022-03-30"/>
-          <PropertyValue Property = "Version" String="2022-03/Tasks_And_Plans"/>
-          <PropertyValue Property = "Kind" EnumMember="Org.OData.Core.V1.RevisionKind/Deprecated"/>
-          <PropertyValue Property = "Description" String="The Outlook tasks API is deprecated and will stop returning data on June 30, 2024. Please use the new To Do API."/>
-          <PropertyValue Property = "RemovalDate" Date="2024-06-30"/>
-        </Record>
-      </Collection>
-    </Annotation>
-    ...
-  </EntityType>
-~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+```xml
+<EntityType Name="outlookTask" BaseType="Microsoft.OutlookServices.outlookItem" ags:IsMaster="true" ags:WorkloadName="Task" ags:EnabledForPassthrough="true">
+  <Annotation Term="Org.OData.Core.V1.Revisions">
+    <Collection>
+      <Record>
+        <PropertyValue Property = "Date" Date="2022-03-30"/>
+        <PropertyValue Property = "Version" String="2022-03/Tasks_And_Plans"/>
+        <PropertyValue Property = "Kind" EnumMember="Org.OData.Core.V1.RevisionKind/Deprecated"/>
+        <PropertyValue Property = "Description" String="The Outlook tasks API is deprecated and will stop returning data on June 30, 2024. Please use the new To Do API."/>
+        <PropertyValue Property = "RemovalDate" Date="2024-06-30"/>
+      </Record>
+    </Collection>
+  </Annotation>
+</EntityType>
+```
 
 When the request URL contains a reference to a deprecated model element, the gateway will add a [Deprecation
 header](https://tools.ietf.org/html/draft-dalal-deprecation-header-02) (with the