<https://eu.kamik.com/de/blogs/freeyourplay/are-we-squeezing-too-many-activities-into-our-childrens-schedule-1>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://eu.kamik.com/de/blogs/freeyourplay/are-we-squeezing-too-many-activities-into-our-childrens-schedule-1>