Jane Austen's powers of observation, her sense of humor, and her nuanced delineation of character suggest some of the difficulties — and temptations — of adapting her novels for the stage. Jonathan Dove feels 'Mansfield Park' told him it needed an opera. Opera, which enforces refinement and concentration on sources from prose fiction, is a hard taskmaster for anyone tackling such a project. But Jonathan Dove and his librettist, Alasdair Middleton, took on the challenge with "Mansfield Park." According to the English composer, interviewed at the Basile Opera Center on Monday: "'Emma' and 'Pride and Prejudice' are the Austen novels I liked most. But I never heard music with those books. But there was something incomplete about 'Mansfield Park.' It asked itself to be made into an opera." Dove, in town for the American professional premiere of the work by Indianapolis Opera , explains it this way: Fanny Price, the heroine, i...