[Half a CW: VO publishing lore] If you are publishing astronomical image collections using #DaCHS, you will probably still speak the old #standard, Simple Image Access version 1. Its successor, #SIAv2, is more than 10 years old by now, and so I figured it's time to migrate. Here, I am telling you how to do that: https://blog.g-vo.org/porting-a-dachs-siap1-service-to-siap2.html