Ruby on rails sitemap.xml structure

[brianvest]

Is their a recommended way/best practice to implement sitemap.xml files on a site built with ruby on rails?

[Mobilio]

XML sitemap is well defined here:
http://www.sitemaps.org/protocol.html

But i can quickly resume:

• limitation up to 50000 URLs and up to 50MB as file. If you need more you can split them as sitemap index with several sitemaps.
• sitemap index are up to 50000 sitemaps and up to 10MB as file.
• lastmod, priority and change frequency didn't play HUGE role anymore: https://www.seroundtable.com/google-lastmod-xml-sitemap-20579.html https://www.seroundtable.com/google-priority-change-frequency-xml-sitemap-20273.html but just keep them to be fully formatted.
• sitemaps can be compressed (gzip)
• sitemap must be UTF-8 encoded but beware of entities - Ampersand, Single Quote, Double Quote, Greater Than, Less Than. You must replace them with % char codes.
• you can put sitemap location in robots.txt. You can place there also few sitemaps. Sitemaps can be located on 3rd party servers too.

I think that this is most important in XML sitemaps.