What is "ultrajectine"

The Ultrajectine tradition is that of the Old Catholic Church of the Netherlands headquartered at Utrecht, Netherlands, Ultrajectine thought holds to the words of Vincent of Lérins's Commonitory: "We must hold fast to that faith which has been held everywhere, always, and by all the faithful." Ultrajectine thought rejects papal infallibility and holds to the belief that only the Church in Ecumenical Council may speak infallibly.