Later versions of the software introduced new file formats. To support the new features, especially typographic, introduced with InDesign CS, both the program and its document format are not backward-compatible. Instead, InDesign CS2 introduced the INX (.inx) format, an XML-based document representation, to allow backwards compatibility with future versions. InDesign CS versions updated with the 3.1 April 2005 update can read InDesign CS2-saved files exported to the .inx format. The InDesign Interchange format does not support versions earlier than InDesign CS. With InDesign CS4, Adobe replaced INX with InDesign Markup Language (IDML), another XML-based document representation.[4]
Christopher Smith is president of American Graphics Institute in Boston, Massachusetts. He is the publisher and editor of the Digital Classroom book series, which have sold more than one million copies. At American Graphics Institute, he provides strategic technology consulting to marketing professionals, publishers and to large technology companies including Google, Apple, Microsoft, and HP. An expert on web analytics and digital marketing, he delivers Google Analytics training along with workshops on digital marketing topics. He is also the author of more than 10 books on electronic publishing tools and technologies, including the Adobe Creative Cloud for Dummies. Christopher did his undergraduate studies the at the University of Minnesota, and then worked for Quark, Inc. prior to joining American Graphics Institute where he has worked for 20 years. sequential numbering using publisher