void unserialize(SerializeFormat format, Extensible* container, const std::string& value) CXX11_OVERRIDE;
void set(Extensible* container, const std::string& value);
void unset(Extensible* container);
void unserialize(SerializeFormat format, Extensible* container, const std::string& value) CXX11_OVERRIDE;
void set(Extensible* container, const std::string& value);
void unset(Extensible* container);