2.1/samples/showcase/src/com/google/gwt/sample/showcase/Showcase.gwt.xml

<module rename-to="showcase">
  <!-- Inherit the core Web Toolkit stuff. -->
  <inherits name="com.google.gwt.core.Core"/>
  <inherits name='com.google.gwt.user.User'/>
  <inherits name="com.google.gwt.i18n.I18N"/>
  <inherits name="com.google.gwt.i18n.CldrLocales"/>
  <inherits name="com.google.gwt.user.theme.standard.StandardResources"/>

  <!-- Enable debug ID. -->
  <inherits name="com.google.gwt.user.Debug"/>
  <set-property name="gwt.enableDebugId" value="true"/> 

  <!-- Use a generator to create the source code -->
  <generate-with class="com.google.gwt.sample.showcase.generator.ShowcaseGenerator">
    <when-type-assignable class="com.google.gwt.sample.showcase.client.Showcase.GeneratorInfo" />
  </generate-with>

  <!-- Specify the app entry point class. -->
  <entry-point class='com.google.gwt.sample.showcase.client.Showcase'/>

  <!-- Internationalization support. -->
  <extend-property name="locale" values="en"/>
  <extend-property name="locale" values="ar"/>
  <extend-property name="locale" values="fr"/>
  <extend-property name="locale" values="zh"/>
  <set-property-fallback name="locale" value="en"/>
</module>