Index: openacs-4/packages/acs-templating/tcl/head-procs.tcl
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/packages/acs-templating/tcl/head-procs.tcl,v
diff -u -r1.45.2.2 -r1.45.2.3
--- openacs-4/packages/acs-templating/tcl/head-procs.tcl	27 Mar 2019 17:21:20 -0000	1.45.2.2
+++ openacs-4/packages/acs-templating/tcl/head-procs.tcl	27 Mar 2019 17:47:16 -0000	1.45.2.3
@@ -722,6 +722,16 @@
     return $resource
 }
 
+ad_proc template::head::can_resolve_urn {
+    resource
+} {
+    Return a boolean value indicating, whether we can resolve the URN.
+} {
+    return [info exists ::template::head::urn($resource)]
+}
+
+
+
 ad_proc template::head::prepare_multirows {} {
     Generate multirows for meta, css, scripts
     Called only from blank-master.tcl