diff --git a/web/CXM_making_a_web_site.anubis b/web/CXM_making_a_web_site.anubis
index 35e633d..c025f64 100644
--- a/web/CXM_making_a_web_site.anubis
+++ b/web/CXM_making_a_web_site.anubis
@@ -1050,7 +1050,21 @@ public type HTML_Partial_Content:
     HTML_Off_Form
   )
   .
-   
+
+public define List(HTML_Head_Tag)
+  to_HTML_Head_Tag
+  (
+    List(CSS_File) css_file_list
+  )=
+  map((CSS_File css_f) |-> css(css_f), css_file_list).
+
+public define List(HTML_Head_Tag)
+  to_HTML_Head_Tag
+  (
+    List(JS_File) js_file_list
+  )=
+  map((JS_File js_f) |-> js(js_f), js_file_list).
+  
 public type HTML_In_Form:
    literal_pt            (Printable_tree), 
    literal               (String), 
--
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