output-path is cased

quad/quadwriter/attrs.rkt

@@ -128,6 +128,7 @@ Naming guidelines
                font-tracking
                font-baseline-shift
                font-case
+                           
                bg
                link
                href
@@ -139,6 +140,8 @@ Naming guidelines
                page-number
                doc-title
 
+               output-path
+
                pdf-title
                pdf-subject
                pdf-author
@@ -293,7 +296,8 @@ Naming guidelines
                      :pdf-author
                      :pdf-keywords
                      :string
-                     :footer-text)) #true))
+                     :footer-text
+                     :output-path)) #true))
 
 (define (takes-path? k)
   (and (memq k (list :image-file)) #true))