diff -r 27dd409fba1d -r d57a12b8f5db svghmi/hmi_tree.ysl2
--- a/svghmi/hmi_tree.ysl2	Mon Mar 23 10:16:38 2020 +0100
+++ b/svghmi/hmi_tree.ysl2	Mon Mar 23 15:13:36 2020 +0100
@@ -52,14 +52,44 @@
     }
 }
 
+def "func:get_hmi_tree_elt" {
+    param "path";
+    param "root", "$hmitree";
+    message > get_hmi_tree_elt «$path»
+    if "not(starts-with($path, '/'))" error > Given path "«$path»" should start with a "/"
+    const "stripped", "substring($path, 2)";
+    const "token" choose {
+        when "contains($stripped, '/')" value "substring-before($stripped, '/')";
+        otherwise value "$stripped";
+    }
+
+    choose {
+        when "string-length($token) = 0"{
+            result "$root";
+        }
+        otherwise{
+            const "rest", "substring-after($stripped, $token)";
+            const "match", "$root/*[@name = $token]";
+            choose {
+                when "string-length($rest) > 0"{
+                    result "func:get_hmi_tree_el($rest, $match)";
+                }
+                otherwise{
+                    result "$match";
+                }
+            }
+        }
+    }
+}
+
 //  Parses:
 //  "HMI:WidgetType:param1:param2@path1@path2"
 //
 //  Into:
-//  widget type="WidgetType" {
+//  widget type="WidgetType" id="blah456" {
 //      arg value="param1";
 //      arg value="param2";
-//      path value="path1";
+//      path value="path1" index="345";
 //      path value="path2";
 //  }
 //