Commentary for sketches encompassing two pages

modules/fontane/transform.xqm

@@ -218,9 +218,20 @@ as item()* {(
                     if( config:get("sade.develop") = "true" )
                     then code:main($node)
                     else code:main($node, false(), "hljs-", true()),
+                    (: for normal tei:surfaces :)
                     for $n in $node/following-sibling::tei:note
-                    where $n >> $node and $n << ($node/following-sibling::tei:surface)[1]
-                    return  code:main($n)
+                        where $n >> $node and $n << ($node/following-sibling::tei:surface)[1]
+                        return  code:main($n),
+                    (: for tei:surfaces that are part of a "Doppelseitenansicht".
+                    in this case an associated tei:note is encoded after the first/left
+                    tei:surface but should also be displayed on the second/right one. :)
+                    if($node/@prev and $node/preceding-sibling::*[1][self::tei:note]) then
+                        for $n in $node/preceding-sibling::tei:note
+                            where $n >> $node/preceding-sibling::tei:surface[1]
+                            return
+                                code:main($n)
+                    else
+                        ()
                 }
               }
             }