John Paul II, Code of Canon Law, 25-I-1983, AAS 75 (1983) Pars II
BOOK II. THE PEOPLE OF GOD LIBER II. DE POPULO DEI
PART I. THE CHRISTIAN FAITHFUL
TITLE III. SACRED MINISTERS OR CLERICS
THE ENROLLMENT, OR INCARDINATION, OF CLERICS
Can. 265 Every cleric must be incardinated either in a particular church or personal prelature, or in an institute of consecrated life or society endowed with this faculty, in such a way that unattached or transient clerics are not allowed at all.
Can. 266 §1. Through the reception of the diaconate, a person becomes a cleric and is incardinated in the particular church or personal prelature for whose service he has been advanced.
§2. Through the reception of the diaconate, a perpetually professed religious or a definitively incorporated member of a clerical society of apostolic life is incardinated as a cleric in the same institute or society unless, in the case of societies, the constitutions establish otherwise.
§3. Through the reception of the diaconate, a member of a secular institute is incardinated in the particular church for whose service he has been advanced unless he is incardinated in the institute itself by virtue of a grant of the Apostolic See.
Can. 294 After the conferences of bishops involved have been heard, the Apostolic See can erect personal prelatures, which consist of presbyters and deacons of the secular clergy, to promote a suitable distribution of presbyters or to accomplish particular pastoral or missionary works for various regions or for different social groups.
Can. 295 §1. The statutes established by the Apostolic See govern a personal prelature, and a prelate presides offer it as the proper ordinary; he has the right to erect a national or international seminary and even to incardinate students and promote them to orders under title of service to the prelature.
§2. The prelate must see to both the spiritual formation and decent support of those whom he has promoted under the above-mentioned title.
Can. 296 Lay persons can dedicate themselves to the apostolic works of a personal prelature by agreements entered into with the prelature. The statutes, however, are to determine suitably the manner of this organic cooperation and the principal duties and rights connected to it.
Can. 297 The statutes likewise are to define the relations of the personal prelature with the local ordinaries in whose particular churches the prelature itself exercises or desires to exercise its pastoral or missionary works, with the previous consent of the diocesan bishop.