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XML or eXtensible Markup Language is a web language derived from SGML (Standard Generalized Markup Language), which has been invented before. XML is nearly similar to HTML in the case that they both are derived from SGML. XML technology development was started in 1996 and had received recognition from the World Wide Web Consortium (W3C) in February 1998, while SGML itself was developed in the early 1980s. At the time HTML was developed in 1990, the originators of the XML adopted the most important part of the SGML and, based on the development of HTML, produced a markup language ​​that was not less awesome than SGML. XML is now broadly used to define a construction of a website. Therefore, website owners should master basic XML scripting and keep certain XML editor in their inventory.

In a simple explanation, XML is a language used for describing and manipulating structured documents. Technically, XML is defined as a meta-markup language that provides a specific format for the documents that comprise structured data. Markup language is a structured mechanism to recognize a document. XML is a profile application of SGML. As defined by ISO 8879, SGML is a standardized method and vendor-independent.

XML does not have a precise definition because there is an opinion explaining that XML is not a programming language, but XML is a syntax used to describe other markup languages, that’s why it is called meta-language. However, there is another opinion stating that XML is a markup language based on that XML is a separate language used for separate purpose. Such purpose is sometimes considered quite important especially in the website construction. XML is used to expedite the way every website navigates among its pages. That’s why the XML editor assistantship is considered crucial in the website building activity to prevent scripting mistake from occurring.