HTML Parsing

It would be great if autotools had an html parser (there are quite a few parser libraries that could possibly be used to make this easier to implement). This would enable me to grab content from websites that don't provide an xml or json feed of data (such as a train timetable page that doesn't offer an API), or to do things like check for updates on a particular part of a website (e.g. the html element containing the price of a product on a shopping website).