What is the correct name for IEEE Std 1003.1, 2004 Edition: POSIX.1-2001 or POSIX.1-2004?
<p>I came across two POSIX documents online.</p>

<ul>
<li><a href="http://pubs.opengroup.org/onlinepubs/009695399/">http://pubs.opengroup.org/onlinepubs/009695399/</a> (IEEE Std 1003.1, 2004 Edition)

<blockquote>
  <p><strong>Abstract:</strong> The 2004 edition incorporates Technical Corrigendum Number 1 and Technical Corrigendum 2 addressing problems discovered since the approval of the 2001 edition. These are mainly due to resolving integration issues raised by the merger of the Base documents.</p>
</blockquote></li>
<li><a href="http://pubs.opengroup.org/onlinepubs/9699919799/">http://pubs.opengroup.org/onlinepubs/9699919799/</a> (IEEE Std 1003.1™, 2013 Edition)

<blockquote>
  <p><strong>Abstract:</strong> POSIX.1-2008 is simultaneously IEEE Std 1003.1™-2008 and The Open Group Technical Standard Base Specifications, Issue 7. This 2013 Edition includes IEEE Std 1003.1-2008/Cor 1-2013 incorporated into IEEE Std 1003.1-2008 (the base document). The 2013 edition incorporates Technical Corrigendum 1 addressing problems discovered since the approval of the 2008 edition.</p>
</blockquote></li>
</ul>

<p>I want to know whether the first document is known as POSIX.1-2001 or POSIX.1-2004.</p>

<p>The <a href="https://en.wikipedia.org/wiki/POSIX">Wikipedia article on POSIX</a> mentions the first one as POSIX.1-2004. But why? The base document of the first one is 2001 edition. So shouldn't it still be called POSIX.1-2001? The 2004 edition only adds TC1 and TC2 to the base document.</p>

<p>For example, see the second one. Although it is 2013 edition but since the base document is 2008 edition, it is called POSIX.1-2008. Then why is the first one not called POSIX.1-2001?</p>