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Imagine writing a program to implement a student registration system at acollege or university. When a student is registering for classes,you’ll need to be able to answer questions of the form “isAlice eligible to be added to the roster for Price Theory?” to decidewhether to allow her to click to add that particular course. To do so,you’ll need to know Price Theory’s prerequisites: what classesmust you have already passed before you can take Price Theory?
Clauses may represent one of three types of information packaging. The most common is topic--comment (referent--predication) packaging, assumed in Chapters 6–9. The topic may be the most central participant (the ‘subject’; see Chapter 6), or there may be multiple participants high in topicality. A variety of strategies is used when the most topical participant is not the most central one, or is not a participant at all. Thetic packaging does not divide a clause into topic and comment. Thetic packaging is associated with certain situation types (including weather), and discourse functions such as presentation and background description. Identificational packaging divides the information into a focus and a presupposed open proposition (POP). A number of contexts are typically construed as identificational, including questions and answers and different types of contrast. Thetic and identificational strategies include distinct prosody and word order, and/or distinct morphosyntax. Most thetic strategies involve making the subject argument phrase look less like a subject, and/or making the predicate look less like a predicate. Identificational strategies include clefts and ellipsis.