virtual void add_metadata (xmlpp::Node *) const = 0;
virtual void send_binary (boost::shared_ptr<Socket>) const = 0;
/** @return true if our image is definitely the same as another, false if it is probably not */
virtual void add_metadata (xmlpp::Node *) const = 0;
virtual void send_binary (boost::shared_ptr<Socket>) const = 0;
/** @return true if our image is definitely the same as another, false if it is probably not */