# File lib/rd/rd2man-lib.rb, line 190
    def apply_to_Reference(element, content)
      case element.label
      when Reference::URL
        apply_to_RefToURL(element, content)
      when Reference::RDLabel
        if element.label.filename
          apply_to_RefToOtherFile(element, content)
        else
          apply_to_RefToElement(element, content)
        end
      end
    end