def remarks(keyword=nil)
     if keyword.nil?
       @remarks
     else
       ukw = keyword.upcase
       @remarks.find_all {|r| r[:keyword] == (ukw)}
     end
   end
def remarks(keyword=nil)
     if keyword.nil?
       @remarks
     else
       ukw = keyword.upcase
       @remarks.find_all {|r| r[:keyword] == (ukw)}
     end
   end
Return the remark-elements found in the document. If _keyword_ is
 nil then return all remarks, else only the ones with the right
 keyword.