The newscrawler uses only news sitemaps as "news feed" and ignores "ordinary" sitemaps not following the URLs listed there. However, the crawler should follow sitemaps listed in a sitemap index and check whether one of them is a news sitemap.
E.g. while https://www.greenwichtime.com/sitemap_news.xml is not a news sitemap, it links to a bunch of news sitemaps:
The newscrawler uses only news sitemaps as "news feed" and ignores "ordinary" sitemaps not following the URLs listed there. However, the crawler should follow sitemaps listed in a sitemap index and check whether one of them is a news sitemap. E.g. while https://www.greenwichtime.com/sitemap_news.xml is not a news sitemap, it links to a bunch of news sitemaps: