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<chapter id="intro-repoconvs-layout">
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<title>Repository Layout</title>
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<para>
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&TCAR; is supported by
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url="http://subversion.tigris.org/">Subversion</ulink>, a
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version control system which allows you to keep old versions
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of files and directories (usually source code), keep a log of
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who, when, and why changes occurred, etc., like CVS, RCS or
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SCCS.
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</para>
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<para>
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When using Subversion there is one <quote>source
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repository</quote> and many <quote>working copies</quote> of
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that source repository. The working copies are independent one
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another, can be distributed all around the world and provide a
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local place for designers, documentors, translators and
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programmers to perform their work in a descentralized way.
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The source repository, on the other hand, provides a central
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place for all independent working copies to interchange data
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and provides the information required to permit extracting
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previous versions of files at any time.
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</para>
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<para>
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The first level of directories in the repository provides
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organization through a convenctional <quote>trunk</quote>,
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<quote>branches</quote> and <quote>tags</quote> layout. In
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this configuration the
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class="directory">trunk</filename> directory is where main
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changes take place, the
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class="directory">tags</filename> directory is where frozen
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copies of <filename class="directory">trunk</filename> changes
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are placed in for releasing, and the
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class="directory">branches</filename> directory is an
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intermediate place between
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class="directory">trunk</filename> and
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class="directory">tags</filename> states where changes take
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place before being merged into
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class="directory">trunk</filename> and finally released into
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<filename class="directory">tags</filename>.
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</para>
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<para>
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The second level of directories in the repository provides
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organization for each work line described in
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linkend="intro-worklines" />.
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</para>
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<para>
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All other subsequent levels of directories in the repository,
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from third level on, are created to organize specific concepts
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related to the work line they are in. A complete reference for
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each directory inside &TCAR; is available at
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linkend="dirs" />.
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</para>
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</chapter>
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