docs: def full_stylesheet(self):
          """
          Return the style sheet that will ultimately be inserted into
          the latex document.
  
          This is the user given style sheet plus some additional parts
          to add the meta data.
          """
          latex_fragment = r"""
          \usepackage[colorlinks=true,linkcolor=blue,urlcolor=blue]{hyperref}
          \hypersetup{
             pdftitle={%s},
             pdfauthor={%s},
             pdfsubject={%s}
          }
          """ % (self.document.properties.get("title"),
                 self.document.properties.get("author"),
                 self.document.properties.get("subject"))
          return latex_fragment + self.stylesheet