See http://gohugo.io/sitemap.xml for an example:
<url>
<loc>http://gohugo.io/</loc>
<lastmod>2015-07-21T10:00:00+00:00</lastmod>
<priority>0</priority>
</url>
The homepage priority is always 0, even if a different value is set in the config file, e.g.:
[sitemap]
priority = "0.5"
(As an aside, the sitemap config setting is not documented anywhere, the configuration page mentions it but doesn't define it).
As an aside: Documentation fixes are always welcome.
I didn't even know there were a sitemap config :=)
Once I have better understanding of what it's supposed to do, I'm happy to post a documentation update. For now my understanding consists solely in what I've grepped out of the codebase, so I was hesitant to do so.
Posted https://github.com/spf13/hugo/pull/1332 to improve the sitemaps docs.
This has popped up again in recent versions.
@aureooms, then open a new issue. Please don't comment on issues that have been closed for a year.