Index: openacs-4/packages/xowiki/tcl/resource-init.tcl
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/packages/xowiki/tcl/resource-init.tcl,v
diff -u -N -r1.3.2.1 -r1.3.2.2
--- openacs-4/packages/xowiki/tcl/resource-init.tcl	22 Apr 2019 10:42:11 -0000	1.3.2.1
+++ openacs-4/packages/xowiki/tcl/resource-init.tcl	12 May 2019 19:55:44 -0000	1.3.2.2
@@ -1,5 +1,5 @@
 #
-# register some URNs that we are providing for sharing
+# Register some URNs that we are providing for sharing.
 #
 template::register_urn -urn urn:ad:js:jquery      -resource /resources/xowiki/jquery/jquery-3.4.0.min.js
 template::register_urn -urn urn:ad:js:jquery-ui   -resource /resources/xowiki/jquery/jquery-ui.min.js
@@ -11,7 +11,28 @@
 template::register_urn -urn urn:ad:js:bootstrap3-treeview \
     -resource //cdnjs.cloudflare.com/ajax/libs/bootstrap-treeview/1.2.0/bootstrap-treeview.min.js
 
+#
+# Produce the xowiki.css variants that can be included based on preferred CSS tookit:
+#
+#    xowiki.css + xowiki-yui-specific.css        -> xowiki-yui.css
+#    xowiki.css + xowiki-bootstrap3-specific.css -> xowiki-bootstrap3.css
+#
+set resDir $::acs::rootdir/packages/xowiki/www/resources
+foreach variant {yui bootstrap3} {
+    if {![file exists $resDir/xowiki-$variant.css]
+	|| [file mtime $resDir/xowiki-$variant.css] < [file mtime $resDir/xowiki.css]
+	|| [file mtime $resDir/xowiki-$variant.css] < [file mtime $resDir/xowiki-$variant-specific.css]
+    } {
+	set content ""
+	set F [open $resDir/xowiki.css]; append content [read $F] \n; close $F
+	set F [open $resDir/xowiki-$variant-specific.css]; append content [read $F] \n; close $F
+	set F [open $resDir/xowiki-$variant.css w]; puts -nonewline $F $content; close $F
+	unset content
+    }
+}
+
 template::register_urn -urn urn:ad:css:bootstrap3 -resource //maxcdn.bootstrapcdn.com/bootstrap/3.4.1/css/bootstrap.min.css
-template::register_urn -urn urn:ad:css:xowiki     -resource /resources/xowiki/xowiki.css
+template::register_urn -urn urn:ad:css:xowiki-yui -resource /resources/xowiki/xowiki-yui.css
+template::register_urn -urn urn:ad:css:xowiki-bootstrap -resource /resources/xowiki/xowiki-bootstrap3.css
 template::register_urn -urn urn:ad:css:bootstrap3-treeview \
     -resource //cdnjs.cloudflare.com/ajax/libs/bootstrap-treeview/1.2.0/bootstrap-treeview.min.css