Data conversion script in Python

I need a script to convert files for a hybrid HTML language to a WIKI language. I want this in python, and the program is to search for files recursively converting files it finds. ## Deliverables From the current directory, the software needs to recursively look for files with a .wml extension and process them, saving the results with a .txt extenion. The file needs to convert from THE WML web format into a PmWIKI format. The whole idea is that the software needs to be extendable by me to add more formats. If it finds a HTML tag that it does not know about it should warn the user. <zwue> ' = ' Space, Equals, Space </zwue> ' = ' Space, Equals, Space <subheadline> ' == ' Space, Equals, Equals, Space </subheadline> ' == ' Space, Equals, Equals, Space <b> ''' 2 x ' </b> ''' 3 x ' <i> '' 2 x ' <\i> '' 2 x ' <a href=URL>Text</a> [[ URL | Text ]] <boiler> Hard copied text <page_title name="text"> (:Title text :) # remove this line <img src=URL align=blah> %align=blah% URL <p> New line In addition, the following custom tag definitions , as well as standard tables, need to be decoded into PmWIKI tables. ([login to view URL]) <table>, <tr>, <td> <myrows> <hrow "text"> <faq> <hfaq> <myfaq> <define-tag myrows endtag=required> <table cellspacing=6 cellpadding=0 border=0> %body </table> </define-tag> <define-tag hrow> <tr><td colspan=2><font face="Arial,Helvetica" size=+2><br><b>%0</b></font></td> </tr> </define-tag> # 0 = href, 1 = text, 2 = img 3 = rhs desc <define-tag row> <tr> <td align=right border=6> <if %0 "<a href=%0>" ""> <if %2 "<img src=%2 alt="%1">" "<b>%1</b>" /> <if %0 "</a>" ""> &nbsp; <if %0 "<a href="%0 " target="_blank" >X</a> &nbsp;&nbsp;&nbsp; </td>" "" > <td>%3</td> </tr> </define-tag> <define-tag faq endtag=required> <table cellspacing=6 cellpadding=0 border=0> %body </table> </define-tag> <define-tag hfaq> <tr><td colspan=2><font face="Arial,Helvetica" size=+2><br><b>%0</b></font></td> </tr> </define-tag> <define-tag myfaq> <tr> <td>Q: %0</td> <td>A: %1</td> </tr> </define-tag>