Resource modelResource {
    URI = "platform:/resource/myProject/model/myModel.xmi";
}

Resource acceptanceTestsResource {
   URI = "retro:/myTestProject/*";
      or
   URI = "retro:/myTestProject/*mypackage/*Te?t.java";
}

public class EclipseProjectFactory implements Resource.Factory {

	public Resource createResource(URI uri) {
                // First segment of the uri is the project name
		String projectName = uri.segment(0);

		if (projectName != null) {
			IWorkspace wksps = ResourcesPlugin.getWorkspace();
			if (wksps != null) {
				IProject prj = wksps.getRoot().getProject(projectName);
                                // If a project with that name exists in the workspace
				if (prj != null) {
					Resource result = new ResourceImpl(uri);
                                        // we create an instance of the EclipseProject Eclass
					Project eclipseProject = EclipseProjectFactory.eINSTANCE.createEclipseProject();
					eclipseProject.setId(projectName);

                                         // And fill the 'natures' EAttribute with th actual natures associated to this project
                                        for (String nature: prj.getDescription().getNatureIds()) {
											eclipseProject.getNatures().add(nature);
										}
					result.getContents().add(eclipseProject);
					return result;
				}
			}

		}
		return null;
	}

 <extension
         point="org.eclipse.emf.ecore.protocol_parser">
      <parser
            class="my.project.EclipseProjectFactory"
            protocolName="eclipseProject">
      </parser>
   </extension>

  <extension
         point="org.eclipse.mylyn.docs.intent.client.synchronizer.extension">
      <SynchronizerExtensionDescription
            class="my.project.EclipseProjectChangeListener"
            handled_uri_scheme="eclipseProject">
      </SynchronizerExtensionDescription>
   </extension>

Document {
     Chapter The @SampleProject@ project {
         Section SampleProject purpose {
              In this section, we will explain why the @SampleProject@ has been created.

              @M
                    new EclipseProject SampleProject {
                       id = "com.my.company.sampleproject";
                       natures += "org.eclipse.jdt.core.javanature";
                    }
              M@
         }
         Section Sample Project natures {
              For a very good reason, we decided to add the 'acceleo' nature to the SampleProject
             @M
                 SampleProject  {
                   natures += "org.eclipse.acceleo.ide.ui.acceleoNature";
                 }
             M@
         
             // And here is how to declare the Resource
             @M
                 Resource sampleProjectResource {
                     URI = "eclipseProject:/com.my.company.sampleproject";
                 }
             M@

          }
     }
}