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moreover, if i want to restrict the indexing of a URL, then, is it sufficient to not include it in Sitemap or it has to restricted in robots file.
For not indexing the URL, just add it the robots.txt file. You can also change the HTML meta data of your HTML page to none, but not necessary
Google reference here - [googlewebmastercentral.blogspot.com...]
If you use both a robots.txt file and robots meta tags
If the robots.txt and meta tag instructions for a page conflict, Googlebot follows the most restrictive. More specifically:
If you block a page with robots.txt, Googlebot will never crawl the page and will never read any meta tags on the page.
If you allow a page with robots.txt but block it from being indexed using a meta tag, Googlebot will access the page, read the meta tag, and subsequently not index it.