For now, I’ve removed the image sitemap, using the following option of Yoast WordPress SEO:
Version 5.8 (June 3, 2011)
Feature: Added the Permalink Tweaker module, which lets you remove permalink bases for categories, tags, and/or custom taxonomies
I’ve also upgraded to NextGEN Gallery Version 1.8.1.
I still wonder if there is an SEO advantage of having a separate image sitemap by tags, which still doesn’t function.
Thank you Alex for the prompt response.
I see that the images are listed also in my case but not under ngg_tag-sitemap.xml which has the date of 1970-01-01 00:00 and includes lines of the tags with zero images. This is a bug, and I’m not sure if it’s related to NextGen Gallery or to Yoast WordPress SEO.
I see you don’t have in your index xml ngg_tag-sitemap.xml or category-sitemap.xml. What should be done for removing the ngg_tag-sitemap.xml?
Manually editing the index xml is not the best solution.
Why should I use ngg_tag-sitemap.xml if my images are already listed in the pages/posts sitemaps?
I do want the images to be easily found in Google image search.
