Make note of a scenario that could trigger a special case

bundles/org.eclipse.epsilon.emc.rdf/src/org/eclipse/epsilon/emc/rdf/RDFResource.java

@@ -103,7 +103,7 @@ private Collection<Object> filterByPreferredLanguage(Collection<Object> value, L
 				RDFLiteral literal = (RDFLiteral) element;
 				literalsByTag.put(literal.getLanguage() == null ? "" : literal.getLanguage(), literal);
 			} else {
-				// TODO see if we run into this scenario, print some warning, return value as is as fallback
+				// TODO see if we run into this scenario (perhaps with integers instead of strings?), print some warning, return value as is as fallback
 				throw new IllegalArgumentException("Expected RDFLiteral while filtering based on preferred languages, but got " + element);
 			}
 		}