@Override
  public void unregisterInterest(Object key) throws CacheWriterException {
    throw new UnsupportedOperationException(
        "Unsupported at this time");
  }
Adds a subregion with the given name to this region


@throws RegionExistsException If a subregion with <code>name</code> already exists
geode-core/src/main/java/org/apache/geode/internal/cache/xmlcache/RegionCreation.java