There are six types of DTB that can be produced. Each of the six from one to six requires more resources to create than the previous. The definitions below are quoted from the DAISY 2005 Structure Guidelines, thus the text file type given is XML rather than XHTML which is the text source in DAISY 2.02 DTBs.
Source: DAISY 2005 Structure Guidelines
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Audio with Title element only: DTB without structure. This is the simplest type of DTB and is used for books where structure will not be applied. The XML textual content file may not be present, or if it is, contains only the title of the book, and other required notation. The book must be read linearly. Direct access to points within the DTB is not possible.
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Audio with NCX only (see "The NCX" below): DTB with structure. The NCX is the Navigation Control Center, a file containing all points in the book to which the user may navigate. The XML textual content file, if present, contains only the structure of the book and may contain links to features such as narrated footnotes, etc. This is the most common form of DTB and is ideal for stand-alone players.
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Audio with NCX and partial text: DTB with structure and some additional text. The XML textual content file contains only the structure of the book and the text of components where keyword searching and direct access to the text would be beneficial, e.g., index, glossary, etc.
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Audio and full text: DTB with structure and complete text and audio. This form of a DTB is the most complex but provides the greatest level of access. The XML textual content file contains the structure and the full text of the book. The audio and the text are synchronized.
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Full text and some audio: DTB with structure, complete text and limited audio. The XML textual content file contains the structure and the text of the book. The audio files contain recordings of parts of the text. This type of DTB could be used for a dictionary where only pronunciations were provided in audio form.
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Text and no audio E-text with structure. The XML textual content file contains the structure and text of the book. There are no audio files.