Dynamically generate XML sitemaps. Compress sitemap files. Use a sitemap index file. Use image tags in existing sitemaps. Use video and Google News sitemaps if relevant.

I believe Google's John Mueller was recommending ... But John Mueller did downplay the use of priority and change frequency tags within the XML Sitemap file.

In an XML sitemap file ... engines track and index significant changes to webpages. Google provides guidelines for using the lastmod tag, which could be used to alter search snippets.

Detailed information on sitemaps and the benefits of using them. This article covers how to properly create an XML sitemap using different tools and details on how you can fix existing sitemap errors.

Google's John Mueller spoke a bit more about when you should update the date in the lastmod tag in the XML sitemap file. He said on Twitter if you are "providing something new for search engines ...

one that begins and ends with “/”), then use the match() method of the string you want to search. The regular expression that matches any XML tag is this: /(.>.>)/ That expression matches an ...

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