Index: openacs-4/packages/categories/www/categories-browse.tcl
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/packages/categories/www/categories-browse.tcl,v
diff -u -N -r1.9.4.6 -r1.9.4.7
--- openacs-4/packages/categories/www/categories-browse.tcl	11 Oct 2013 12:08:22 -0000	1.9.4.6
+++ openacs-4/packages/categories/www/categories-browse.tcl	29 Jul 2014 10:56:36 -0000	1.9.4.7
@@ -14,7 +14,7 @@
     {subtree_p:optional f}
     {letter:optional all}
     {join:optional or}
-    package_id:optional
+    package_id:naturalnum,optional
 } -properties {
     page_title:onevalue
     context_bar:onevalue