In the Catholic Masses I have been to, it begins with a procession of the priest along with acolytes and such and someone is holding up the Book of the Gospels decorated in gold or otherwise. This gets placed on the altar and the priest reads from it.
Could a Catholic priest potentially use a digital tablet (iPad, etc.) that contains the text of the Book of the Gospels (or the Lectionary for that matter) in place of this gilded one used during mass? Is there some requirement that the one used in mass has to have a certain appearance, or be made in a certain way? While I'm sure there are a number of reasons that this wouldn't be done (the possibility of technical difficulties, disapproval from parishioners who think it's inappropriate), is there anything within canon law or other church "rules" that would prevent this?