D.1. About This Document
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## D.1. About This Document

This document is written in DocBook XML. Output formats are generated by various programs using information from the `docbook-xml` and `docbook-xsl` packages.

In order to increase the maintainability of this document, we use a number of XML features, such as entities and profiling attributes. These play a role akin to variables and conditionals in programming languages. The XML source to this document contains information for each different architecture — profiling attributes are used to isolate certain bits of text as architecture-specific.

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