content: 
  on run argv
      set out to "["
      tell document id (item 1 of argv) of application "Keynote"
          set nms to name of every master slide
          repeat with i from 1 to the count of nms
              set rec to "{" & ¬
                  "\"name\": \"" & item i of nms & "\"" & ¬
                  "}"
              if i > 1 then
                  set out to out & ", "
              end if
              set out to out & rec
          end repeat
      end tell
      set out to out & "]"
      out
  end run
  