Will new generation replace a previous generated URLs entirely?

[booking]

- Will new generation replace a previous generated URLs entirely?
- If not, can I set up the generation to ignore pages that are not updated and re-generate only the updated urls and new pages? so, it can shorten the time.

[XML-Sitemaps Support]

Hello,

sitemap is completely replaced (you can make a copy of existing sitemap if you need though).
Sitemap generator has to re-crawl all pages, otherwise it won't be able to tell which pages were added and removed.