samples/plugin/src/META-INF/plugin.xml

<idea-plugin>
<!-- plugin name -->
  <name>Sample</name>
<!-- description -->
  <description>A minimalistic sample plugin for IntelliJ IDEA</description>
<!-- plugin version -->
  <version>1.0</version>
  <vendor>IntelliJ</vendor>
<!-- minimum IDEA build number with which the plugin is compatible -->
 <!--
  <idea-version since-build="2000"/>
  -->
<!-- application components of the plugin -->
  <application-components>
    <component>
<!-- component implementation class -->
      <implementation-class>com.intellij.openapi.samples.SampleApplicationPlugin</implementation-class>
<!-- component interface class -->
      <interface-class>com.intellij.openapi.samples.SampleApplicationPlugin</interface-class>
    </component>
  </application-components>
<!-- project components of the plugin -->
  <project-components>
    <component>
      <implementation-class>com.intellij.openapi.samples.SampleProjectPlugin</implementation-class>
      <interface-class>com.intellij.openapi.samples.SampleProjectPlugin</interface-class>
    </component>
  </project-components>
</idea-plugin>