--- a/artifacts/doc/conf/themes/virtual.xml	Mon Feb 19 18:04:25 2018 +0100
+++ b/artifacts/doc/conf/themes/virtual.xml	Tue Feb 20 18:43:32 2018 +0100
@@ -79,16 +79,20 @@
 
     <theme name="Areas" type="virtual">
         <fields>
+            <!-- 'showarea' is not used in the code... -->        
             <field name="showarea" type="boolean" display="Flaeche anzeigen"
                 default="true" />
             <field name="showarealabel" type="boolean"
                 display="Flaechenbeschriftung anzeigen" default="false" />
             <field name="areabgcolor" type="Color" display="Fuellfarbe"
                 default="0, 100, 0" />
+            <!-- 'areashowbg': no code exits that reads it... -->                
             <field name="areashowbg" type="boolean"
                 display="Hintergrund anzeigen" default="true" hidden="true" />
+            <!-- FIXME: "areashowborder" does not exist, the constant in ThemeDocument is 'showborder" -->
             <field name="areashowborder" type="boolean"
                 display="Flaechebegrenzungslinie anzeigen" default="false" />
+            <!-- 'areabordercolor' is not used in the code..., implementation uses 'linecolor' -->                
             <field name="areabordercolor" type="Color" default="0, 0, 0"
                 display="Begrenzungslinienfarbe" />
             <field name="areatransparency" type="int" default="50" display="Transparenz" />