The XML header references resources which are outdated and should not be used like this: http://www.w3.org/2001/XMLSchema-instance
This reference also seems to be outdated: http://www.w3.org/1999/xhtml
Looking into Google's documentation about sitemap handling and the official sitemap format documentation, I learned that what we do here is outdated and should be updated/adjusted for this package.
Please see for current implementation.
The XML header references resources which are outdated and should not be used like this: http://www.w3.org/2001/XMLSchema-instance
This reference also seems to be outdated: http://www.w3.org/1999/xhtml
Looking into Google's documentation about sitemap handling and the official sitemap format documentation, I learned that what we do here is outdated and should be updated/adjusted for this package.
Please see for current implementation.