[Click] Question about Address Translator

[luca.capisani at virgilio.it]

Hi,
          I'm reading the Peilei Fan thesis about the IPv6 elements to realize
nat-pt. I saw that Peilei writes that the address and ports of IPv4 and
IPv6 packets can be changed with an "Address and Port Translator" APT.
But, when I see the official click documentation, the Address and Port Translator
does not exist, I can see only "Address Translator", witch I understand
it has the same function of APT.
Are there two differents elements one called Addr and Port Translator, the
second AddressTranslator, or are the same element called Address Translator?
thank you
Capisani Luca