Index: openacs-4/packages/xowiki/xowiki.info
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/packages/xowiki/xowiki.info,v
diff -u -r1.180.2.108 -r1.180.2.109
--- openacs-4/packages/xowiki/xowiki.info	26 Nov 2022 17:00:29 -0000	1.180.2.108
+++ openacs-4/packages/xowiki/xowiki.info	24 Dec 2022 16:33:24 -0000	1.180.2.109
@@ -10,7 +10,7 @@
     <inherit-templates-p>t</inherit-templates-p>
     <auto-mount>xowiki</auto-mount>
 
-    <version name="5.10.1d38" url="http://openacs.org/repository/download/apm/xowiki-5.10.1d38.apm">
+    <version name="5.10.1d39" url="http://openacs.org/repository/download/apm/xowiki-5.10.1d39.apm">
 	<owner url="mailto:neumann@wu-wien.ac.at">Gustaf Neumann</owner>
 	<summary>A xotcl-based enterprise wiki system with multiple object types</summary>
 	<release-date>2021-09-15</release-date>
@@ -55,7 +55,7 @@
 	<license>BSD-Style</license>
 	<maturity>2</maturity>
 
-	<provides url="xowiki" version="5.10.1d38"/>
+	<provides url="xowiki" version="5.10.1d39"/>
 	<requires url="xotcl-core" version="5.10.1d14"/>
 	<requires url="acs-datetime" version="5.9.1"/>
 	<requires url="acs-kernel" version="5.10.0"/>
Index: openacs-4/packages/xowiki/catalog/xowiki.de_DE.ISO-8859-1.xml
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/packages/xowiki/catalog/xowiki.de_DE.ISO-8859-1.xml,v
diff -u -r1.47.2.24 -r1.47.2.25
--- openacs-4/packages/xowiki/catalog/xowiki.de_DE.ISO-8859-1.xml	26 Jun 2022 19:29:50 -0000	1.47.2.24
+++ openacs-4/packages/xowiki/catalog/xowiki.de_DE.ISO-8859-1.xml	24 Dec 2022 16:33:24 -0000	1.47.2.25
@@ -199,6 +199,7 @@
   <msg key="Page-title">Titel der Seite</msg>
   <msg key="Page-validate_name">%errorMsg%</msg>
   <msg key="Page-validate_name-duplicate_item">Another item with the name &#39;%value%&#39; exists already in this folder</msg>
+  <msg key="Page-validate_name-invalid_name">Die Kurzbezeichung &#39;%value%&#39; ist ung�ltig</msg>
   <msg key="Page-validate_page_order">Page Order ung�ltig, nur Buchstaben, Ziffern, Punkte und Unterstrich sind erlaubt.</msg>
   <msg key="page_kind">Art</msg>
   <msg key="page_title">Seitentitel</msg>
Index: openacs-4/packages/xowiki/catalog/xowiki.en_US.ISO-8859-1.xml
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/packages/xowiki/catalog/xowiki.en_US.ISO-8859-1.xml,v
diff -u -r1.71.2.29 -r1.71.2.30
--- openacs-4/packages/xowiki/catalog/xowiki.en_US.ISO-8859-1.xml	26 Jun 2022 19:29:50 -0000	1.71.2.29
+++ openacs-4/packages/xowiki/catalog/xowiki.en_US.ISO-8859-1.xml	24 Dec 2022 16:33:24 -0000	1.71.2.30
@@ -210,6 +210,7 @@
   <msg key="Page-validate_form_constraints">%errorMsg%</msg>
   <msg key="Page-validate_name">%errorMsg%</msg>
   <msg key="Page-validate_name-duplicate_item">Another item with the name &#39;%value%&#39; exists already in this folder</msg>
+  <msg key="Page-validate_name-invalid_name">Name &#39;%value%&#39; is invalid</msg>
   <msg key="Page-validate_page_order">Page Order invalid; might only contain upper and lowercase letters, underscore, digits and dots</msg>
   <msg key="page_kind">Type</msg>
   <msg key="Page_pretty_name">XoWiki Page</msg>
Index: openacs-4/packages/xowiki/tcl/xowiki-procs.tcl
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/packages/xowiki/tcl/xowiki-procs.tcl,v
diff -u -r1.542.2.167 -r1.542.2.168
--- openacs-4/packages/xowiki/tcl/xowiki-procs.tcl	15 Dec 2022 19:30:02 -0000	1.542.2.167
+++ openacs-4/packages/xowiki/tcl/xowiki-procs.tcl	24 Dec 2022 16:33:24 -0000	1.542.2.168
@@ -2925,7 +2925,15 @@
         set success 0
       }
     } else {
-      set errorMsg [_ xowiki.Page-validate_name-duplicate_item [list value $name]]
+      #
+      # The plain form valudation has signaled, that the name is not
+      # ok. Try to provide a more detailed error message.
+      #
+      if {![:istype ::xowiki::File] && [regexp {^[a-zA-Z][a-zA-Z]:$} $name]} {
+        set errorMsg [_ xowiki.Page-validate_name-invalid_name [list value $name]]
+      } else {
+        set errorMsg [_ xowiki.Page-validate_name-duplicate_item [list value $name]]
+      }
     }
 
     if {$success} {