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Mars is the code name for technology being developed by Adobe that provides an Extensible Markup Language (XML)-based representation of Portable Document Format (PDF) documents. Adobe® PDF is a universal file format for representing documents in a manner independent of the application software, hardware, and operating system used to create them and of the output device on which they are to be displayed or printed. XML is a cross-platform, extensible, and text-based standard for representing data that was created so that richly structured documents could be used over the web.