Digital Accessible Information SYstem, or DAISY, is a format standard based on the W3C defined SGML applications XHTML 1.0 and SMIL 1.0. It is standardized as ANSI/NISO Z39.86-2005.[1] Using this framework, a talking book format is presented that enables navigation within a sequential and hierarchical structure consisting of (marked-up) text synchronized with audio. DAISY assists people who, for different reasons, have problems using regular printed media. DAISY books have the benefits of regular audiobooks, but they are superior due to the embedded navigating levels (currently 6 in the DAISY 2.02 standard), the content (i.e. other objects such as images, graphics, MathML etc) and displaying synchronized text to speech. For example, DAISY books can enable users who are blind to navigate an encyclopedia. An encyclopedia as a regular audio book would be useless because it lacks search and navigation features and requires a linear listen.
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