This context describes the reason well for which the XML appeared: necessity of a consistent and interopervel standard for transference of data. For Daum and Merten (2002, P. 6) ' ' in few years of its existence, the diverse XML has been the base for (approximately 500) definitions of linguagem' '. It would make (2005, p.14), affirms that ' ' in coherence terms, the W3C has left clearly that the future of the marking languages will be based on XML, what sample that the HTML, main language of marking of the W3C, will evolve for the XML' '. 3 – APPLICATION Daum and Merten (2002, p.6), affirms that ' ' the XML was created not as a language of special use, but as one ' ' mother of linguagens' ' , a generic metalanguage. The objective of its definition was extensibilidade' '. According to Jorgensen (2002, p.64), the XML contains given self-sufficient in format document.

Therefore, it is an independent platform. With its use it is easy to transmit a document of a site for another one saw HTTP. More necessarily the XML is used in the communication and in the exchange of information between applications you go off. For It hisses (2001, p.18), one of the main purposes of the XML it is the storage and transaction of data between companies, that is, the Business You Business (B2B). It would make (2005, p.28) standes out that, the XML revealed widely executable and easy of being developed, being considered of great importance in the Internet and great intranets, therefore to provide interoperao with computers thanks to a flexible and opened standard, independent of device. With it, applications can be constructed and be brought up to date more quickly, allowing multiple platforms of visualization of the structuralized data. According to Jorgensen (2002, p.63), ' ' the XML is quickly if becoming the universal protocol for transference of information between sites it saw HTTP' '. The trend is that the HTML continues being the used language to show documents in the Internet and that effectiveness XML is each time more used to transmit, to change and to manipulate given.