In 2009 Pope Benedict published an Apostolic Constitution called Anglicanorum Coetibus providing for the creation of Personal Ordinariates for Anglicans who wished to join the Roman Catholic Church.
This, it says, was to maintain the liturgical, spiritual and pastoral tradition of the Anglican Communion within the Catholic Church as a precious gift ... a treasure to be shared.
As far as I know there are now three of these Personal Ordinariates, one for Great Britain, one for North America and one for Australia and Japan.
In 1906 when some members of the Russian Orthodox Church formed an Eastern Rite church, the Russian Greek Catholic Church, and asked Pope Pius IX what they needed to change in their Rite he said "nec plus, nec minus, nec altera" - add nothing, subtract nothing, change nothing.
I understand that a different approach was adopted with the Anglican (ex-Angllican?) Ordinarates than with the Eastern Rite Churches, but how does the doctrine or practice differ in the Ordinariates from in the Church of England (for example)? What has been added, what has been taken away and what has been changed?
(I have looked at the Ordinariate website and can't find anything specific.)