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<h2 class="title" style="clear: both"><a id="svn.forcvs.revnums"></a>Revision Numbers Are Different Now</h2>
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<p>In CVS, revision numbers are per file. This is because CVS
stores its data in RCS files; each file has a corresponding RCS
file in the repository, and the repository is roughly laid out
according to the structure of your project tree.</p>
<p>In Subversion, the repository looks like a single
filesystem. Each commit results in an entirely new filesystem
tree; in essence, the repository is an array of trees. Each of
these trees is labeled with a single revision number. When
someone talks about <span class="quote">“<span class="quote">revision 54</span>”</span>, he's talking
about a particular tree (and indirectly, the way the filesystem
looked after the 54th commit).</p>
<p>Technically, it's not valid to talk about <span class="quote">“<span class="quote">revision 5
of <code class="filename">foo.c</code>.</span>”</span> Instead, one would say
<span class="quote">“<span class="quote"><code class="filename">foo.c</code> as it appears in revision
5.</span>”</span> Also, be careful when making assumptions about the
evolution of a file. In CVS, revisions 5 and 6 of
<code class="filename">foo.c</code> are always different. In Subversion,
it's most likely that <code class="filename">foo.c</code> did
<span class="emphasis"><em>not</em></span> change between revisions 5 and
6.</p>
<p>Similarly, in CVS, a tag or branch is an annotation on the
file or on the version information for that individual file,
whereas in Subversion, a tag or branch is a copy of an entire
tree (by convention, into the <code class="filename">/branches</code>
or <code class="filename">/tags</code> directories that appear at the top
level of the repository, beside <code class="filename">/trunk</code>). In
the repository as a whole, many versions of each file may be
visible: the latest version on each branch, every tagged
version, and of course the latest version on the trunk
itself. So, to refine the terms even further, one would often
say <span class="quote">“<span class="quote"><code class="filename">foo.c</code> as it appears in
<code class="filename">/branches/REL1</code> in revision
5.</span>”</span></p>
<p>For more details on this topic, see <a class="xref" href="svn.basic.in-action.html#svn.basic.in-action.revs" title="Revisions">the section called “Revisions”</a>.</p>
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