fix class names starting with a digit

modules/fontane/transform.xqm

@@ -610,7 +610,11 @@ let $seq :=
     for $s in tokenize(replace(replace($style, 'radius:', 'radius'), '\s|\.|%|-style', ''), ';')
     where not(matches($s, "^margin\-left:\d{1,2}\.{0,1}\d{0,1}cm$"))
     return
-        tokenize($s, ':')
+        tokenize($s, ':') !
+            (
+                (if (matches(., "^\d")) then ("d" || .) else .)
+             ! (if(matches(., "^\-")) then ("minus" || .) else .)
+            )
 let $rendSeq :=
     for $r in tokenize(replace($rend, '\s', ''), ';')
     return