plugins/devkit/testData/codeInsight/pluginIntf.xml

<!DOCTYPE idea-plugin PUBLIC "Plugin/DTD" "http://plugins.intellij.net/plugin.dtd">
<idea-plugin>
  <idea-version since-build="3000"/>
  <application-components>
    <component>
      <implementation-class></implementation-class>
      <interface-class>I<caret>ntf</interface-class>
    </component>
  </application-components>
</idea-plugin>