WMS and AWI API
Antonie wants us to integrate the AWI Maps Service at maps.awi.de
For this we need to write a source that can consume Web Map Services
WMS specification is at https://www.ogc.org/standards/wms but the Wikipedia article at https://en.wikipedia.org/wiki/Web_Map_Service also helps.
We definitely also need to support the GetFeatures call, but for a start GetCapabilities and tile sampling are plenty.