[marble] [Bug 474786] New: Missing documentation for `.dgml` files.

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https://bugs.kde.org/show_bug.cgi?id=474786

            Bug ID: 474786
           Summary: Missing documentation for `.dgml` files.
    Classification: Applications
           Product: marble
           Version: unspecified
          Platform: unspecified
                OS: Linux
            Status: REPORTED
          Severity: wishlist
          Priority: NOR
         Component: data
          Assignee: marble-bugs at kde.org
          Reporter: felics-kde at kettenbruch.de
  Target Milestone: ---

Ahoj,

I miss a complete documentation of all the options the KDE Marble's map
definition `.dgml`-files can take and what they do.

Currently, I always have to resort on trying to infer from already created
maps, but that probably results in not good custom `.dgml` files (see e.g.
https://gitlab.com/dreieckli/marble-maps-extra,
https://gitlab.com/marble-restricted-maps/virtualearth,
https://aur.archlinux.org/packages/marble-maps-sachsen,
https://gitlab.com/dreieckli/marble-maps-thunderforest). Specifically, I want
to make a hillshading-only map from the tiles at
http://osmscout.karry.cz/hillshade/ (see
https://gitlab.com/dreieckli/marble-maps-extra/-/tree/main/maps/earth/hillshading-karry
for .dgml file), but I fail since the tiles are only alpha(?) overlays and I
not yet found out a way how to blend them on a background. Also, I could not
change the empty map background even with setting `<map bgcolor="#cccccc">` or
something else -- it stays black.

I am very confused what is possible with `.dgml`-files and how to set map
background -- so I request a documentation for people who want to provide maps
for KDE marble.

I think if this is easier, more maps would be publicly provided, which in turn
could make KDE marble more popular.

Regards!

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