It is stands for "Extensible Markup Language." (Technically it should be EML). XML is employed to describe documents with a standard format that can be read by any XML-compatible application. The language can be used along with HTML pages, however XML itself is not a markup language. Rather then, it is a "meta language" that can be used to develop markup languages for specific applications. For instance, it can describe items that may be accessed when a Web page loads. On the whole, XML let you to develop a database of information without an actual database. Whereas it is commonly used in Web applications, several other programs can use XML documents as well.
Why uses XML:
XML provides programmers and document authors both with a friendly environment, at least via computing standards. XML's rigid set of rules helps in make documents more readable to machines and humans both. XML document syntax has a fairly small set of rules, making it achievable for developers to get started right away.
XML is extensible in two senses. Firstly, it let developers to develop their own DTDs, effectively developing 'extensible' tag sets that can be used for multiple applications. Secondly, XML itself is being extended with various additional standards that add linking styles and referencing ability to the core XML set of capabilities.
XML can be used on a broad variety of platforms and interpreted with a broad variety of tools. Since the document structures behave consistently, parsers that interpret them may be built at comparatively low cost in any of a number of languages. XML supports many key standards for character encoding, letting it to be used all over the world in a number of different computing environments.
Though there have been some questions regarding the process used to develop XML, the standard itself is completely open, freely obtainable on the web. The W3C members have early access to standards (and, separately from invited experts, are the just ones who can participate directly in their creation), however once the standard is complete the results are public.
Difference between XML and HTML:
1) XML is not replacement for HTML.
2) They both were designed with different goals:
3) HTML is about displaying information, whereas XML is about carrying information.
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