Hello,
I've a really small website, so I usually update the sitemap by hand! In each "url" element there are the fields: loc, lastmod, changefreq and priority.
The "lastmod" field is setup to the date in witch I update the content of the related PHP page or the content that is loaded dynamically in the related PHP page!
I've tried to use http://www.xml-sitemaps.com/ to verify if all it was right, and I've noticed that in the generated sitemap there isn't the "lastmod" field!
In the Google wiki, about how to write a sitemap, there's written that is a good practice to setup the "lastmod" field even for dynamic pages; so, my question is ...
Is the "lastmod" field needed or not?
Thanks in advace!