Charles and Janet Herring of LeRoy announce the engagement of their daughter, Danielle D. Herring, to Anthony Ianni, son of Beniamino and Linda Ianni of Corfu. A Sept. 3 wedding is being planned. The bride-elect is a graduate of Hartwick College and is completing a master's degree at University of Rochester, where she is head men's and women's swimming and diving coach. Her fiance is a graduate of Canisius College and received a master's degree from Brockport State College. He is a teacher in Attica Central School District.