Update xml_format.md

facontidavide · web-flow · commit 24f0d5c4d9eb · 2018-12-17T17:57:07.000+01:00
diff --git a/docs/xml_format.md b/docs/xml_format.md
@@ -97,6 +97,10 @@ To make the compact version of our tree compatible with Groot, the XML must be m
  </root>
 ```
 
+!!! Note "XML Schema available for explicit version"
+    You can download the [XML Schema](https://www.w3schools.com/xml/schema_intro.asp) here:
+    [behaviortree_schema.xsd](https://github.com/BehaviorTree/BehaviorTree.CPP/blob/master/behaviortree_schema.xsd).
+
 ## Subtrees
 
 As we saw in [this tutorial](tutorial_D_subtrees.md), it is possible to include
