XML is stands, simple, self-describing way of encoding both text and data so that content can be processed with relatively little human intervention and exchanged across driver’s hardware, operating system and applications. XML offers a widely adopted standard way of representing text and data. www.tutorialguide.net is good place to learn the XML for freshers. Hope it will help.
u can learn XML on the website w3schools and you can use the sytax of XML for creating the sitemap in XML format for Google Crawler
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To learn XML try w3schools tutorials, they have tutorials on almost any topic. XML is very useful to create sitemaps for submission to Google.