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So don't include links to the articles in the main sitemap if they are already in the wordpress sitemap?

I have a regular site map on my site and I also have a Wordpress site installed within it that we use for blog/news content.  I currently have an auto-sitemap generator installed in Wordpress which automatically updates the sitemap and submits it to the search engines each time the blog is updated.

The question I have (which I think I know the answer to but I just want to confirm) is do I have to include all of the articles within the blog in the main site's sitemap despite the Wordpress sitemap having them in there already?

If I do include the articles in the main website's sitemap, they would also be in the Wordpress sitemap as well, which is redundant. Redundancy is not good, so I just want to make sure.

Do the urls towards the top get higher priority?