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

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

  <extensionPoints>
    <extensionPoint name="myLanguageEP" beanClass="MyLanguageAttributeEPBean"/>
  </extensionPoints>

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

    <myLanguageEP language="My<caret>LanguageID"/>
    <myLanguageEP language="MyAnonymousLanguageID"/>

    <myLanguageEP language="<error descr="Cannot resolve language with id ''INVALID_VALUE''">INVALID_VALUE</error>"/>
    <myLanguageEP language="<error descr="Cannot resolve language with id ''AbstractLanguageIDMustNotBeVisible''">AbstractLanguageIDMustNotBeVisible</error>"/>
  </extensions>

</idea-plugin>