<https://watch-insider.com/news/erwin-sattler-if-size-matters-for-you-and-you-are-willing-to-learn-something-about-precision-pendulum-clocks-please-take-some-time-an-enjoy-this-video/#article>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://watch-insider.com/news/erwin-sattler-if-size-matters-for-you-and-you-are-willing-to-learn-something-about-precision-pendulum-clocks-please-take-some-time-an-enjoy-this-video/>