Maybe before we do anything to these historical articles we need to be very clear and decided on the following:  (1) what is doctrine? (2) what are its sources?  (3) how does it develop over time? 

The Anglicans have done a lot of work in this area. The following quotes come from their draft document titled "The Principles of Canon Law Common to the Churches of the Anglican Communion."  

For those who don't know, the "Anglican Communion" is that particular group of Anglican churches which some conservatives have been separating from, because of the Communion's openness to considering doctrinal development in controversial areas (such as the ordination of women and homosexuals).  For example, our Anglican Church of Canada belongs to the Communion, but not every Anglican Church does.

What doctrine is:

"Doctrine is the teaching of the church on any matter of faith which a church receives, believes and represents afresh from generation to generation by virtue of its belonging to the one wholy, catholic and apostolic church." from Draft of the Principles of Canon Law Common to the Churches of the Anglican Communion, Part V, Principle 47

The sources of doctrine:

"The faith of Our Lord Jesus Christ is taught in the Holy Scriptures, held in the Primitive Church, summed up in the Creeds, and affirmed by the ancient Fathers and undisputed General Councils.  The Holy Scriptures of the Old and New Testaments contain all things necessary to salvation and represent the supreme standard of faith with the Apostles and Nicene Creeds.  The Thirty-Nine Articles of Religion, the Book of Common Prayer 1662 and the Ordinal represent the historic Anglican sources of lawful doctrine [...because they "may be understood as ground in the Holy Scriptures, and in such teachings of the ancient Fathers and Councils of the Church as are agreeable to the Holy Scriptures"]. Part V, Principle 48

The development of doctrine

It is not lawful for the church to ordain any thing contrary to God's Word written.  A church must maintain the Faith, Doctrine, Sacraments and Discipline of the One, Holy, Catholic and Apostolic Church, and its own doctrine should be compatible with the faith revealed in Holy Scripture, summed up in the creeds, and received, practised and held by the church universal in the light of tradition and reason.

A church may draw up its own formularies of faith set out in terms that it considers suitable to the present day and to the needs of its peoples and circumstances so that the faith may be presented loyally and intelligibly from generation to generation.