code: @Required
      public final void setPersonAttributeDaos(final List<IPersonAttributeDao> daos) {
          Validate.notNull(daos, "The IPersonAttributeDao List cannot be null");
          this.personAttributeDaos = Collections.unmodifiableList(daos);
      }
docs: Set the {@link List} of delegates which we will poll for attributes.
  
  @param daos The personAttributeDaos to set.
  @throws IllegalArgumentException If daos is <code>null</code>.