Abstract
Extensible Markup Language (XML) is really a method of describing data in a format that makes it intelligible to applications no matter what format the data needs to be read in. XML makes it possible to express the same data in multiple forms. It was originally intended for use on Web site documents just like Hypertext Markup Language (HTML) was. However, its potential for transforming and reusing data has placed it far beyond simply this use. One would ask, “Because XML is really just a specification, and XML documents are really just text with tags, why do I need to worry about security?” The answer is that because XML is so versatile, it can be used to move data back and forth between two applications; for instance, from a Web site to a database management system. In some implementations, this information can be confidential, so security should be considered as to what users of a Web site or Web application using XML are allowed to see. This chapter gives a functional overview of XML and key concepts associated with it. The risks associated with using XML improperly and ways to secure data manipulated by XML are also covered.
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