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XML Sitemap - Image support for sitemaps #386
We should discuss whether to do like (I think) Jetpack does and include them (in the source) for featured images or in a separate sitemap.
referenced this issue
Sep 6, 2017
PR #978 adds support for images in the main XML Sitemap and adds a column that displays the number of images for each sitemap entry.
We have discussed whether images should be in a separate sitemap or in the main sitemap and decided to include them in the main sitemap as this appears to be what Google expects (https://support.google.com/webmasters/answer/178636?hl=en).
We have also discussed whether this should be a part of the new Image SEO module which will be a Pro only feature and decided that this should remain as part of the free XML Sitemap functionality.