//1. create new EObject: JavaMask mask = MaskFactory.eINSTANCE.createJavaMask()

//2. do some other things with mask....(calling some setters)

//3. Create some resource and add the mask to it
org.eclipse.emf.common.util.URI uri = workflow.eResource().getURI().trimSegments(1).appendSegment(mask.getName() + ".mask");
					XtextResource newResource = (XtextResource) workflow.eResource().getResourceSet().createResource(uri);
					newResource.getContents().add(mask);

//4. Save the new file newResource.save(SaveOptions.newBuilder().format().getOptions().toOptionsMap() );

//5. connect new created mask to a step in workflowFile

//6. Calling builder to resolve references
ResourceSet resourceSet = workflow.eResource().getResourceSet();
					if (resourceSet instanceof XtextResourceSet) {
						XtextResourceSet xtextresourceset = (XtextResourceSet) resourceSet;
						Object classpathURIContext = xtextresourceset.getClasspathURIContext();
						if (classpathURIContext instanceof IJavaProject) {
							IJavaProject project = (IJavaProject) classpathURIContext;
							project.getProject().refreshLocal(IResource.DEPTH_INFINITE, PerfLogFactory.newProgressMonitor());
							project.getProject().build(IncrementalProjectBuilder.INCREMENTAL_BUILD, PerfLogFactory.newProgressMonitor());
						}
						else
							LOGGER.error("ClasspathURIContext of resource " + workflow.eResource().toString() + " was not an javaproject");
					}
					else
						LOGGER.error("resourceset of resource " + workflow.eResource().toString() + " was not an xtextresourceset");