component = Reader {
	uri = "platform:/resource/org.xtext.example.generator/src/model/default.graph"
	modelSlot = "qgraph"
}	
component = org.eclipse.xtext.mwe.Reader {
	// lookup all resources on the classpath
	// useJavaClassPath = true

	// or define search scope explicitly
	path = modelPath

	// this class will be generated by the xtext generator 
	register = org.xtext.RpgdslStandaloneSetup {}
	load = {
		slot = "model"
		type = "Model"
	}
}

public void invoke(IWorkflowContext ctx) {
	File f = new File(xmiLocation);
	String files[] = f.list(new FilenameFilter(){
		public boolean accept(File arg0, String arg1) {
			return arg1.endsWith(extension);
		}
	});
	ResourceSet set = new ResourceSetImpl();
	for(String file : files){
		String nuri = uri + file;
		set.createResource(URI.createURI(nuri));
	}
	
	ctx.put(getModelSlot(), set.getResources());
}

final Resource res;
		try {
			res = resourceSet.getResource(URI.createURI(uri), true);
			if (res == null)
				throw new WorkflowInterruptedException("Couldn't find resource under " + uri);
			if (!res.isLoaded()) {
				res.load(Collections.EMPTY_MAP);
			}
		}
		catch (final WrappedException e) {
			if (ignoreMissingModel) {
				return null;
			}
			throw new WorkflowInterruptedException("Couldn't load resource under " + uri + " : " + e.getMessage());
		}
		catch (final IOException e) {
			if (ignoreMissingModel) {
				return null;
			}
			throw new WorkflowInterruptedException("Couldn't load resource under " + uri + " : " + e.getMessage());
		}
		final EList<EObject> result = res.getContents();
		if (firstElementOnly) {
			if (result.isEmpty())
				return null;
			return result.iterator().next();
		}
		else
			return result;

package components;

import java.util.ArrayList;
import java.util.List;

import org.eclipse.emf.common.util.URI;
import org.eclipse.emf.ecore.EObject;
import org.eclipse.emf.ecore.resource.Resource;
import org.eclipse.emf.ecore.resource.ResourceSet;
import org.eclipse.emf.ecore.resource.impl.ResourceSetImpl;
import org.eclipse.emf.mwe.core.WorkflowContext;
import org.eclipse.emf.mwe.core.issues.Issues;
import org.eclipse.emf.mwe.core.lib.WorkflowComponentWithModelSlot;
import org.eclipse.emf.mwe.core.monitor.ProgressMonitor;

public class MultiModelReader extends WorkflowComponentWithModelSlot {

	private List<String> uris = new ArrayList<String>();
	
	public void addUri(String uri) {
		uris.add(uri);
	}
	
	@Override
	protected void invokeInternal(WorkflowContext ctx, ProgressMonitor monitor,
			Issues issues) {
		
		ResourceSet set = new ResourceSetImpl();
		List<EObject> allContents = new ArrayList<EObject>();
		for(String uri : uris){
			Resource resource = set.getResource(URI.createURI(uri), true);
			allContents.addAll(resource.getContents());
		}
		ctx.set(getModelSlot(), allContents);
	}

}

<?xml version="1.0"?>
<workflow>

	<property name="src-gen" value="src-gen" />
	
	<!-- set up EMF for standalone execution -->
	<bean class="org.eclipse.emf.mwe.utils.StandaloneSetup" >
		
		<platformUri value=".."/>
		<registerEcoreFile value="src/metamodel/metamodel.ecore" />
	</bean>
	
	<!-- instantiate metamodel -->
	<bean id="mm_emf" class="org.eclipse.xtend.typesystem.emf.EmfRegistryMetaModel"/>

	<!-- load model and store it in slot 'model' -->
	<component class="components.MultiModelReader">
		<uri value="platform:/resource/my.generator.project/src/model/Model.xmi" />
		<uri value="platform:/resource/my.generator.project/src/model/Model2.xmi" />
		<modelSlot value="model" />
	</component>



	<!--  generate code -->
	<component class="org.eclipse.xpand2.Generator">
		<metaModel idRef="mm_emf"/>
		<expand
			value="template::Template::main FOREACH model" />
		<outlet path="${src-gen}" >
			<postprocessor class="org.eclipse.xpand2.output.JavaBeautifier" />
		</outlet>
	</component>
</workflow>

«DEFINE main FOR List[Model]»