hi i have a question regarding SGML.

On this page - http://effbot.org/librarybook/sgmllib.htm

you can find how to extract the title from SGML. The example works only for one title. However I need to extract all titles from the file. I know it was mentioned that I need to overload the unknown_starttag and unknown_endtag but I can't get the hold of it. Can someone please tell me how? any help would be much appreciated. Thanks!