+ (label (format #f "~a\\n~a:~a\\n~a <- ~a" (grob::name grob) file line prop val-str))
+ ;; to keep escaped "\"" we need to transform it to "\\\""
+ ;; otherwise the final pdf-creation will break
+ (escaped-label
+ (regexp-substitute/global #f "\"" label 'pre "\\\"" 'post)))