I use HXT to parse HTML. AFAICT, Hexpat doesn't do much besides parse the XML file into a tree. It doesn't have the niceties that Nokogiri or BeautifulSoup do. For example, I can use Nokogiri to get all the links on a page like so: page.css("a").

HXT allows me to come close to this:

tree >>> getXPathTreesInDoc "//a"

But I haven't seen a single Haskell XML parsing library that is as nice as Nokogiri.