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I understand that the XML is some kind of language to describe documents. Why do

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Question: I understand that the XML is some kind of language to describe documents. Why do we need the XML for data exchange between systems?

Answer: XML is used to aid the exchange of data. It makes it possible to define data in a clear way.
Both the sending and the receiving party will use XML to understand the kind of data that's been sent. By using XML everybody knows that the same interpretation of the data is used.
XML makes communication easy. It's a great tool for transactions between businesses.
But it has much more possibilities.
You can define other languages with XML. A good example is WML (Wireless Markup Language), the language used in WAP-communications.
WML is just an XML dialect.
Web services depend on the ability of parties to communicate with each other even if they are using different information systems. XML (Extensible Markup Language), a markup language that makes data portable, is a key technology in addressing this need. Enterprises have discovered the benefits of using XML for the integration of data both internally for sharing legacy data among departments and externally for sharing data with other enterprises. As a result, XML is increasingly being used for enterprise integration applications, both in tightly coupled and loosely coupled systems. Because of this data integration ability, XML has become the underpinning for Web-related computing.

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