Actually, the definition of "Socratic irony" is very controversial. Until writers like Gregory Vlastos got involved, it was assumed that Socrates was assuming ignorance, but that he had a "real truth" hidden away, and was entrapping his interlocutors to make them look foolish. Many analysts of Socrates currently think that Socrates was not feigning ignorance (and thereby being ironic when he said he knew nothing), but actually engaging in a kind of opening up of himself -- and his interlocutor -- to the search for mutual truth (in the course of which both would look foolish for a long time). This involves differentiating between the early and later Socratic dialogues, and Plato's understanding or misunderstanding of what Socrates was about.

yours,

Peter T.