I recently attended the 4th BioHackathon Germany hosted by the German Network for Bioinformatics Infrastructure (de.NBI). I participated in the project On the Path to Machine-actionable Training Materials in order to improve the interoperability between DALIA, TeSS, mTeSS-X, and Schema.org. This post gives a summary of the activities leading up to the hackathon and the results of our happy hacking.