Update documentation

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pmd_release_notes.html

@@ -1132,6 +1132,21 @@
                 </li>
                 
                 
+                
+                <li class="subfolders">
+                    <a href="#">Experimental features</a>
+                    <ul>
+                        
+                        
+                        
+                        <li><a href="pmd_devdocs_experimental_ast_dump.html">Creating (XML) dump of the AST</a></li>
+                        
+                        
+                        
+                    </ul>
+                </li>
+                
+                
 
             
 
@@ -1346,6 +1361,18 @@ The PMD Designer supports syntax highlighting for Modelica.</p>
 for now. This is to allow us to change the rule API (e.g. the AST classes) slightly and improve
 the implementation based on your feedback.</p>
 
+<h4 id="simple-xml-dump-of-ast">Simple XML dump of AST</h4>
+
+<p>We added a experimental feature to dump the AST of a source file into XML. The XML format
+is of course PMD specific and language dependent. That XML file can be used to execute
+(XPath) queries against without PMD. It can also be used as a textual visualization of the AST
+if you don’t want to use the <a href="https://github.com/pmd/pmd-designer">Designer</a>.</p>
+
+<p>This feature is experimental and might change or even be removed in the future, if it is not
+useful. A short description how to use it is available under <a href="pmd_devdocs_experimental_ast_dump.html">Creating XML dump of the AST</a>.</p>
+
+<p>Any feedback about it, especially about your use cases, is highly appreciated.</p>
+
 <h4 id="modified-rules">Modified Rules</h4>
 
 <ul>