render surface with @n only

modules/fontane/transform.xqm

@@ -2090,7 +2090,7 @@ element xhtml:div {
                                     else ())
                             else (),
             $info := string-join(($fragment, $vakat), ', '),
-            $childs := for $child in $surface//tei:surface[@type= ('clipping', 'additional', 'pocket')]
+            $childs := for $child in $surface//tei:surface[@type= ('clipping', 'additional', 'pocket')][@n]
                         let $vakat-child := if(transfo:vakat($child)) then "vakat" else ()
                         let $n-child := replace($child/string(@n), "_", " ")
                         let $subtype-child := replace($child/string(@subtype), "_", " ")