* the newest available revision, or throws {@link MissingSchemaSourceException}.
* </ul>
*
+ * <p>
* In either case the returned representation is required to report a non-null
* revision in the {@link SourceIdentifier} returned from
* {@link SchemaSourceRepresentation#getIdentifier()}.
*
+ * <p>
* Implementations are not required to provide constant behavior in time, notably
* this different invocation of this method may produce different results.
*