title: What is pluginManagement in Maven's pom.xml?
body: <p>This is a snippet of my pom file.</p>
  
  <pre class="lang-xml prettyprint-override"><code>....
          &lt;plugins&gt;
              &lt;plugin&gt;
                  &lt;groupId&gt;org.apache.maven.plugins&lt;/groupId&gt;
                  &lt;artifactId&gt;maven-dependency-plugin&lt;/artifactId&gt;
                  &lt;version&gt;2.4&lt;/version&gt;                        
                  &lt;executions&gt;
                      &lt;execution&gt;
                          &lt;phase&gt;install&lt;/phase&gt;
                          &lt;goals&gt;
                              &lt;goal&gt;copy-dependencies&lt;/goal&gt;
                          &lt;/goals&gt;
                          &lt;configuration&gt;
                              ......
                          &lt;/configuration&gt;
                      &lt;/execution&gt;
                  &lt;/executions&gt;
              &lt;/plugin&gt;
          &lt;/plugins&gt;
  ...
  </code></pre>
  
  <p>I use it successfully with the command </p>
  
  <pre><code>mvn install
  </code></pre>
  
  <p>But, when I try to enclose it into the "pluginManagement" tag, the <code>maven-dependency-plugin</code> stops working when I launch the <code>install</code> goal.
  Why does the "pluginManagement" tag change the build behavior? Or should I use another goal or option?</p>