Dogma was a rigidly upheld and unquestionable belief. The term originally refered to religious beliefs, but was often used figuratively to describe values held too rigidly, especially commonly Federation values, by those that didn't agree with their values.
After Benjamin Sisko told him that all he was interested in was gaining the advantage, Dukat retorted "Now, don't go spouting off your holier-than-thou Federation fair-play dogma". (DS9: "The Maquis, Part I")
Several weeks later, Elim Garak told Julian Bashir that he was "a prisoner of Federation dogma and Human prejudice". Bashir had told the Cardassian of his dislike for "The Never Ending Sacrifice". (DS9: "The Wire")