openide/plugins/devkit/devkit-java-tests/testData/references/extensions/interfaceExtensionPointDocumentation.xml

<idea-plugin>

    <id>foo</id>

    <extensionPoints>
        <extensionPoint name="bar" interface="bar.MyExtension"/>
    </extensionPoints>

    <extensions defaultExtensionNs="foo">
        <b<caret>ar/>
    </extensions>

</idea-plugin>