body: //div[contains(@class, "announcement_body")]
body: //div[contains(concat(' ',normalize-space(@class),' '),' guide ')]
author: //a[@class="whiteLink"]

test_url: https://steamcommunity.com/games/elitedangerous/announcements/detail/1711828601535410336
test_url: https://steamcommunity.com/sharedfiles/filedetails/?id=3428624761