It appears to be settled in the Catholic theology of orders that Holy Orders consists of deacon, priest, and bishop. All three receive an indelible mark by the sacrament, all three are included in the clergy unlike the women of old. However, the deacon is not "sacerdotal", able to perform sacrificial functions. Clarifying that was the purpose of Omnium in mentem.

This was accomplished by revising Canon 1008 and adding a third paragraph to Canon 1009:

"§3. Those who are constituted in the order of episcopate or presbyterate receive the office and faculty of acting in the person of Christ the Head, while deacons receive the power to serve the people of God in the diaconia of liturgy, word and charity."