Index: openacs-4/packages/xotcl-core/tcl/06-package-procs.tcl
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/packages/xotcl-core/tcl/06-package-procs.tcl,v
diff -u -r1.29.6.5 -r1.29.6.6
--- openacs-4/packages/xotcl-core/tcl/06-package-procs.tcl	11 Sep 2014 07:54:36 -0000	1.29.6.5
+++ openacs-4/packages/xotcl-core/tcl/06-package-procs.tcl	17 Oct 2014 15:53:00 -0000	1.29.6.6
@@ -335,7 +335,27 @@
     #my msg "--R object set to [my set object], url=$url, [my serialize]"
   }
 
+  ::xo::Package instproc handle_http_caching {} {
+    #
+    # Subpackages can overload this method for realizing 
+    #
+    # a) package specific caching policies
+    # b) page-type specific caching policies
+    # c) page specific caching policies
+    #
+    # Items (b) and (c) can e realized via the instance variable of
+    # the package object named "invoke_object", which is set for
+    # non-error cases in e.g. xowiki.
+    #
+    ns_set put [ns_conn outputheaders] "Cache-Control" \
+        "max-age=0, no-cache, no-store"
+    # 
+  }
+
   ::xo::Package instproc reply_to_user {text} {
+
+    my handle_http_caching
+
     #my log "REPLY [::xo::cc exists __continuation]"
     if {[::xo::cc exists __continuation]} {
       #my log "REPLY [::xo::cc set __continuation]"
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 -r1.279.2.15 -r1.279.2.16
--- openacs-4/packages/xowiki/tcl/package-procs.tcl	16 Oct 2014 17:49:43 -0000	1.279.2.15
+++ openacs-4/packages/xowiki/tcl/package-procs.tcl	17 Oct 2014 15:53:00 -0000	1.279.2.16
@@ -451,15 +451,12 @@
     #my proc destroy {} {my log "--P "; next}
   }
 
-  Package instproc reply_to_user {text} {
-    #
-    # When invoke_object is set (standard cases), we can implement a
-    # page-type or page specific caching behavior.
-    #
-    ns_set put [ns_conn outputheaders] "Cache-Control" \
-        "max-age=0, no-cache, no-store"
-    next
-  }
+  #
+  # We could refine here the caching behavior in xowiki
+  #
+  #Package instproc handle_http_caching {} {
+  #  next
+  #}
 
   Package ad_instproc get_parameter {{-check_query_parameter true} {-type ""} attribute {default ""}} {
     resolves configurable parameters according to the following precedence: