Public instruments consequently must bear the name, title, and seal of the official that issued them, and should be written in the presence of witnesses who attested to them.
[1] A public instrument is generally admissible in evidence without the necessity of preliminary proof of its authenticity and due execution.
These categories refer more to the level of evidenciary validity given an instrument in court.
Under these legal systems, to be received as a public instrument, a document must be subjected to a number of conditions.
These include: Any such instrument is said to prove itself, that is, it has the privilege of being free from challenge or rebuttal at court.