# Negation in Disjunctive Normal Form

When a negation surrounds a formula in Disjunctive Normal Form (DNF), is the formula still in DNF?

For example: Would $\lnot((\lnot X\land \lnot Y) \lor (\lnot X \land Y))$ be classed as being in DNF, even though it is surrounded by a negation?

$$\neg((\neg X \land \neg Y) \lor (\neg X \land Y))\equiv(X \lor Y) \land ( X\lor \neg Y)$$