IResource toInterpret = ...
// populate resource set
ResourceSet resourceSet = resourceSetProvider.get(toInterpret.getProject());
Resource emfResource = resourceSet.getResource(URI.createURI(toInterpret.getFullPath().toPortableString()), true);

// here I validate resource and all dependent resources (resource closure)
validateResourceClosure(emfResource)

void validateResourceClosure(Resource resource) {
		for (Resource r : getResourceClosure(resource)) {
			print(validator.validate(r, CheckMode.ALL, null));
		}		
	}

Set<Resource> getResourceClosure(Resource resource) {
		Set<Resource> resourceClosure = new HashSet<Resource>();
		Queue<Resource> queue = new LinkedList<Resource>();

		resourceClosure.add(resource);
		queue.add(resource);
		while (!queue.isEmpty()) {
			resource = queue.poll();
			// follow all identifiers
			TreeIterator<EObject> it = resource.getContents().get(0).eAllContents();
			while (it.hasNext()) {
				EObject eobject = it.next();
				if (eobject instanceof Identifier) {
					Symbol symbol = ((Identifier) eobject).getSymbolRef();
					Resource referenced = symbol.eResource();
					if (referenced != null
							&& !resourceClosure.contains(referenced)) {
						resourceClosure.add(referenced);
						queue.add(referenced);
					}
				}
			}
		}
		return resourceClosure;
	}