I would appreciate if anyone could give me any advice in the best way to use the API to do the following:

For a particular Wikipedia page:
1. Determine if the page has changed in the last 24 hours.
2. Extract from the page only the sections that have changed in the last 24 hours.

I know the index.php call can return a history (e.g. http://en.wikipedia.org/w/index.php?title=Ray_Bradbury&action=history ) which has links that allow you to get particular diffs. However this is intended for human consumption, and would require some screen-scraping to extract out the information I need.

Is there a way to use the API to get similar information as the index.php?*&action=history command, but instead of getting HTML to get an XML or JSON result that is easier to digest?