# Catalan

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DocBook is a Document Type Definition (DTD) maintained by the DocBook Technical Committee of OASIS. It is particularly well suited to books and papers about computer hardware and software (though it is by no means limited to these applications).

Because it is a large and robust DTD, and because its main structures correspond to the general notion of what constitutes a book, DocBook has been adopted by a large and growing community of authors writing documents of all kinds. DocBook is supported out of the box by a number of commercial tools, and there is rapidly expanding support for it in a number of free software environments. These features have combined to make DocBook a generally easy to understand, widely useful, and very popular DTD. Dozens of organizations are using DocBook for millions of pages of documentation, in various print and online formats, worldwide.