In a folded dipole antenna, both ends of a first dipole portion with a feeding portion are connected to both ends of a second dipole portion so that a slot portion may be formed, and the first and the second dipole portion have a width for generating a linearly-polarized wave in a slot mode when an RFID chip is mounted on the feeding portion. A computer system processes structured electronic documents that define objects to be imported into a database in multiple phases. In one embodiment, authentication is performed by comparing shared secrets stored on each of the client and the boot server or authentication proxy.