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3 The documentation sources are written in
4 <em class="firstterm">DocBook</em>, which is a markup language
5 defined in <acronym class="acronym">XML</acronym>. In what
6 follows, the terms DocBook and <acronym class="acronym">XML</acronym> are both
7 used, but technically they are not interchangeable.
9 <span class="productname">DocBook</span> allows an author to specify the
10 structure and content of a technical document without worrying
11 about presentation details. A document style defines how that
12 content is rendered into one of several final forms. DocBook is
13 maintained by the <a class="ulink" href="https://www.oasis-open.org" target="_top">
14 OASIS group</a>. The <a class="ulink" href="https://www.oasis-open.org/docbook/" target="_top">
15 official DocBook site</a> has good introductory and reference documentation and
16 a complete O'Reilly book for your online reading pleasure.
17 The <a class="ulink" href="https://www.freebsd.org/docproj/" target="_top">
18 FreeBSD Documentation Project</a> also uses DocBook and has some good
19 information, including a number of style guidelines that might be
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