[MapProxy] How do I get these tile sets overlayed with transparency?

[Michael Heerdegen]

Hello!

I'm currently doing my first experiments with Mapproxy.  Looks really
neat.  I have some questions though.

My first question is: are there any community created resources of map
sources shared for others?

Then, my main question: I am using a map viewer (osm.el in Emacs) that
only supports tiles coming from a tile service, how do you call it -
tms? the thing with the %z/%x/%y style urls.  This is why I want to
use Mapproxy as...well, proxy :-) to be able to view more kinds of maps.

I now want to get the Topo Plus map provided by German department of
xyz, described here:

  https://gdz.bkg.bund.de/index.php/default/topplusopen-webkarten-topplusopen-webkarten.html

working.

AFAIU, it comes as a bunch of layers the client needs to overlay.  I am
trying and struggling like this:

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but I only ever see one single completely opaque layer in the demo
service - either one of the both configured, depending on the order.

Am I doing something wrong?  Or do I need to grab tiles using a
different map service to be able to make use of transparency?


TIA,

Michael.