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Something in which is an essential part of any site but I cant for the life of me remember if there is a set / recommended limit to the size if should be or is restricted to.

My crawl report is flagging an issue with too many links to one of my pages, this page is my sitemap.html. However, I have coded the page so that if required is specified it generates an .xml version of the page and if not then the html version is displayed. What is the best way to stop the crawl finding the html version whilst maintaining it on the site for clients navigation?