The protocol, agreed with the major search engines, allows you to specify the location of your XML map in the robots.txt file. In the examples, there is a tendency to name this sitemap.xml file, but any name with or without an extension should work as long as the content in this place is XML.
The MIME type specified in the HTTP response may be required by some search engines to be one of the list of text or xml-ish types.
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