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We're not currently displaying the last modified date in our sitemap, e.g.:

<url><loc>http://www.soschildrensvillages.org.uk/about-our-charity</loc></url>

Are their any advantages to including this data? One benefit that occurred to us is that it will enable Google to determine which pages have fresh content and which are therefore worth crawling, helping Google index beneficial changes quicker.

Thanks!

Thanks William - just to clarify, the rationale I don't have is why moz.com mentions that the "notable exception to preferring subfolders is language specific sites".

My inclination is to go with subfolders (as we would if we were e.g. launching a blog), but since the standard advice has a caveat for language specific sites, I'd like to understand why this is so before making a decision.