code: protected Iterable<URI> getTargetURIs(final EObject primaryTarget) {
  		final TargetURIs result = targetURIsProvider.get();
  		uriCollector.add(primaryTarget, result);
  		return result;
  	}
docs: Returns with an iterable of URIs that points to all elements that are
  referenced by the argument or vice-versa.
  
  @return an iterable of URIs that are referenced by the argument or the
  other way around.