Index: openacs-4/packages/xowf/tcl/xowf-procs.tcl
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/packages/xowf/tcl/xowf-procs.tcl,v
diff -u -N -r1.27 -r1.28
--- openacs-4/packages/xowf/tcl/xowf-procs.tcl	7 Oct 2018 11:39:57 -0000	1.27
+++ openacs-4/packages/xowf/tcl/xowf-procs.tcl	20 Jan 2019 20:44:07 -0000	1.28
@@ -956,7 +956,7 @@
   }
   Condition instproc defaultmethod {} {
     set obj [[:wf_context] object]
-    expr [:expr]
+    expr ${:expr}
   }
 
   #{label "#xowf.form-button-[namespace tail [self]]#"}
@@ -1129,6 +1129,14 @@
     }
   }
 
+  WorkflowPage instproc evaluate_form_field_condition {cond} {
+    set ctx [::xowf::Context require [self]]
+    if {[info commands ${ctx}::$cond] ne ""} {
+      return [${ctx}::$cond]
+    }
+    return 0
+  }
+
   WorkflowPage ad_instproc render_form_action_buttons_widgets {{-CSSclass ""} buttons} {
     With the given set of buttons, produce the HTML for the button
     container and the included inputs.