In applications these and some other forms of ellipsis are handled, where possible, by (a) making strong use of domain-dependent expectations about the types of information and speech acts that are likely to occur in the discourse, such as requests for flight information in an air travel adviser; and (b) interpreting utterances as providing augmentations or modifications of domain-specific knowledge representations built up so far. Corpus-based approaches to ellipsis have so far focused mainly on identifying instances of VP ellipsis in text, and finding the corresponding antecedent material, as problems separate from that of computing correct logical forms (e.g., see Hardt 1997; Nielsen 2004).