code: @Override
      public Set<String> getAvailableQueryAttributes(final IPersonAttributeDaoFilter filter) {
          this.jaxbLoader.getUnmarshalledObject(this.attributeLoader);
          return this.attributesCache;
      }
docs: /* (non-Javadoc)
  @see org.jasig.services.persondir.IPersonAttributeDao#getAvailableQueryAttributes()