plugins/devkit/devkit-java-tests/testData/codeInsight/iconAttribute.xml

<idea-plugin>
  <id>com.intellij.myPlugin</id>
  <vendor>JetBrains</vendor>
  <version>1.0</version>

  <extensionPoints>
    <extensionPoint name="myIconEP" beanClass="MyIconAttributeEPBean"/>
  </extensionPoints>

  <extensions defaultExtensionNs="com.intellij.myPlugin">

    <myIconEP icon="MyIcons.MyCustomIcon"/>

    <myIconEP icon="<error descr="Cannot resolve icon 'INVALID_VALUE'">INVALID_VALUE</error>"/>
    <myIconEP icon="<error descr="Cannot resolve icon 'MyIcons.INVALID_VALUE'">MyIcons.INVALID_VALUE</error>"/>

  </extensions>

  <actions>
    <action id="validIcon" class="foo.FooAction" icon="MyIcons.MyCustomIcon"/>
    <group icon="MyIcons.MyCustomIcon"/>

    <action id="invalidIcon" class="foo.FooAction" icon="<error descr="Cannot resolve icon 'MyIcons.INVALID_VALUE'">MyIcons.INVALID_VALUE</error>"/>
    <group icon="<error descr="Cannot resolve icon 'MyIcons.INVALID_VALUE'">MyIcons.INVALID_VALUE</error>"/>
  </actions>

</idea-plugin>