--- a/svghmi/detachable_pages.ysl2	Tue Mar 23 14:09:55 2021 +0100
+++ b/svghmi/detachable_pages.ysl2	Thu Mar 25 10:13:12 2021 +0100
@@ -93,10 +93,7 @@
 
 const "required_list_elements", "func:refered_elements($hmi_lists[@id = $required_page_elements/@id])";
 
-const "required_elements",
-    """//svg:defs/descendant-or-self::svg:*
-       | $required_list_elements
-       | $required_page_elements""";
+const "required_elements", "$defs | $required_list_elements | $required_page_elements";
 
 const "discardable_elements", "//svg:*[not(@id = $required_elements/@id)]";