title: In maven it's "org.apache.commons.collections:commons-collections" the same as "commons-collections:commons-collections"?
body: <p>I just saw on my pom files that there are two different group id's  for Apache commons-collections:</p>
  
  <pre><code>&lt;dependency&gt;
      &lt;groupId&gt;commons-collections&lt;/groupId&gt;
      &lt;artifactId&gt;commons-collections&lt;/artifactId&gt;
  &lt;/dependency&gt;
  </code></pre>
  
  <p>And this one:</p>
  
  <pre><code>&lt;dependency&gt;
      &lt;groupId&gt;org.apache.commons.collections&lt;/groupId&gt;
      &lt;artifactId&gt;commons-collections&lt;/artifactId&gt;
  &lt;/dependency&gt;
  </code></pre>
  
  <p>Are these two the same? and if they are the same, which one should is use by convention?</p>