title: //h2[@class="post-title"]
author: //header[@class="post-header"]//img/@alt
body: //div[contains(concat(' ',normalize-space(@class),' '),' post-content ')]
date: substring-before(substring-after(//header[@class='post-header'],'Posted on '),'by')

test_url: https://f-droid.org/en/2020/01/16/tracking-the-trackers.html
