The Amazon Kindle's AZW format is just the Mobipocket format with a slightly different serial number scheme, and. It also supports native SQL queries to be used with embedded databases. The Mobipocket ebook format is based on the Open eBook standard using XHTML and can include JavaScript and frames. A structured storage system bundles these elements and any associated content into a single file, with data compression where appropriate. A font-embedding/replacement system to allow fonts to travel with the documents. The PDF combines three technologies: A subset of the PostScript page description programming language for generating the layout and graphics. As a result, MOBI files are identical to Amazon's AZW format for Kindle devices. This company produced Mobipocket Reader applications for computers and smartphones.

The MOBI file extension was created in 2000 by Mobipocket. Each PDF file encapsulates a complete description of a fixed-layout flat document, including the text, fonts, graphics, and other information needed to display it. The Portable Document Format (PDF) is a file format used to present documents independent of application software, hardware, and operating systems. Application/pdf, application/x-pdf, application/x-bzpdf, application/x-gzpdf

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