Define a plug-in called com.example.e4.model.extensions based on OSGi without an activator.

Add a dependency to the org.eclipse.e4.ui.model.workbench, org.eclipse.e4.core.contexts.

Create a folder called model and create a new EMF model called UiExtensions.ecore via File → New → Other... → Eclipse Modeling Framework → EMF Model.

Right-click on the model and select Load Resource....

Click on the Browse Registered Packages and select the model from org.eclipse.e4.ui.model.workbench.

Create a new EClass model element called MyOwnPart and add the following Part ESuper Types to it.

Create another model element called MyOwnPartStack with the supertype PartStack The finished model should look like the following.

Generate a EMF genmodel from this ecore model and create the Java code.

Export all package via the Runtime tab on the plugin.xml.

<?xml version="1.0" encoding="UTF-8"?>
<?eclipse version="3.0"?>

<!--
-->

<plugin>

   <extension point="org.eclipse.emf.ecore.generated_package">
      <package
            uri="http://www.vogella.com/uiextensions"
            class="extension.ExtensionPackage"
            genModel="model/UiExtensions.genmodel"/>
   </extension>

</plugin> 

Note down the uri from the extension point. You need later to define this in your Application.e4xmi.

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http://wiki.eclipse.org/E4 Eclipse E4 - Wiki

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