A browse through a college bookstore conjures up visualizations of certain data structures. The tags under books aren't just price tags. They indicate the course (and if necessary the sections) for which the book in question is required or recommended reading. A virtual college bookstore might be constructed around a table representing such college bookstore cards. For a virtual college bookstore in service to the (a?) pubwan education system, the cards or their virtual representation would logically represent open content textbooks, e.g. one on macroeconomic variables.
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