docs: public Set<URI> collectOutgoingReferences(IResourceDescription description) {
  		URI resourceURI = description.getURI();
  		Set<URI> result = null;
  		for(IReferenceDescription reference: description.getReferenceDescriptions()) {
  			URI targetResource = reference.getTargetEObjectUri().trimFragment();
  			if (!resourceURI.equals(targetResource)) {
  				if (result == null)
  					result = Sets.newHashSet(targetResource);
  				else
  					result.add(targetResource);
  			}
  		}
  		if (result != null)
  			return result;
  		return Collections.emptySet();
  	}