Newadvent does not host the full text of the first seven ecumenical councils. They only host the content which was translated by an Anglican gentleman named Philip Schaff, who was a Church historian. (Mr. Schaff also had other men helping him with the project, btw.) Philip Schaff had a limited purpose in translating the ecumenical councils, and a limited amount of time. He did not intend to give a complete text of all seven councils, not because that would not be useful, but because he had limited resources and needed to produce books quickly, and in fact producing a complete translation was not his purpose. As he explains in the introduction (which is not at NewAdvent), his purpose was to translate the Canons and Decrees of the Councils. The Canons and Decrees are a relatively small amount of material compared to the Sessions. Importantly, however, the Sessions are not infallible. They are the text of the various debates and discussions and proceedings as they were transcribed by the stenographers and edited by the Council Fathers.
