Overview of BookQueryBE TIBCO API Exchange provides a BookQueryBE example that shows how to set up a bookstore application. BookQueryBE is a REST service that allows users to look up book titles stored in an XML file by querying on the author name, title, publisher, or ISBN number. The bookstore example also implements several types of API Exchange throttles: • Rate throttles • Quota throttles • High water mark throttles • Error throttles