XML (Extensible Markup Language) is a set of rules for encoding documents in machine-readable form. It is defined in the XML 1.0 Specification produced by the W3C, and several other related specifications, all gratis open standards.
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Google Webmaster Tools says my XML sitemap “appears to be an HTML page”
We're running a lot of sites and we've started to get a lot of these errors in Webmaster Tools:
Sitemap is HTML
Your Sitemap appears to be an HTML page. Please use a supported sitemap format ...
