what does <lastmod> mean?
- will it gets updated if a new post is added to the discussion? or will it gets updated if the discussion title or content of the first post is changed?
<url>
<loc>https://www.domain.com/ask/d/13-discussion</loc>
<lastmod>2021-08-10T09:22:16+00:00</lastmod>
<changefreq>daily</changefreq>
<priority>0.7</priority>
</url>
