Index: openacs-4/packages/xowiki/tcl/package-procs.tcl
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/packages/xowiki/tcl/package-procs.tcl,v
diff -u -r1.291.2.26 -r1.291.2.27
--- openacs-4/packages/xowiki/tcl/package-procs.tcl	26 Sep 2016 15:07:03 -0000	1.291.2.26
+++ openacs-4/packages/xowiki/tcl/package-procs.tcl	3 Jan 2017 17:13:17 -0000	1.291.2.27
@@ -148,7 +148,7 @@
   }
 
   Package instproc validate_tag {tag} {
-    if {![regexp {^[\w-]+$} $tag]} {
+    if {![regexp {^[\w.-]+$} $tag]} {
       ad_return_complaint 1 "invalid tag"
       ad_script_abort
     }