code: public Iterator<String> list() {
          try {
              final Enumeration<String> keys = pathRegistry.keys();
              return new Iterator<String>() {
                  public boolean hasNext() { return keys.hasMoreElements(); }
                  public String next() { return keys.nextElement(); }
                  public void remove() { throw new UnsupportedOperationException(); }
              };
          } catch (LowlevelStorageException e) {
              throw new FaultException(e);
          }
      }
docs: Gets the keys of all stored items.
  
  @return an iterator of all keys.