what's the best way to convert a OpenOffice (odp) file to HTML?

i already have read about how to do this and the different methods, but: it is worth parsing the xml code inside the odp file? (ex. with PHP) or better with the help of a extern script (eg. python) and the OO api? what's the best solution to开发者_JAVA百科 do this kind of job? what i mean with this question is about performance, security (executing a extern script with php maybe?), and efford (in case of the first question) if there is a better way, i would be glad to hear about it