Sitemap.xsl not processable

support
4

Thank you both!
I tried it like this:

config.toml

[outputs]
    home = ["HTML", "sitemapxsl"]

[outputFormats]
[outputFormats.sitemapxsl]
    baseName = "sitemap"
    mediaType = "text/plain"

[mediaTypes]
    [mediaTypes."application/xslt+xml"]
        suffixes = "xsl"

layouts/
└── index.sitemapxsl.xsl

But I anyway get the error/warning:

WARN 2021/05/03 04:17:18 found no layout file for "sitemapxsl" for layout "main" for kind "home": You should create a template file which matches Hugo Layouts Lookup Rules for this combination.

Isnt the index.sitemapxsl.xsl the right file with the right name in the right folder here?
How to exactly call that file from my layout “main”?
The link describes it as:

But I somehow cant manage to make it work