CentraSite provides a collection of sample queries which can be used fetch the search results directly or in a modified version against the CentraSite server. For the purpose of demonstration, let us suppose that our search data is based on an online fictional store selling a wide range of sheet music. In order to make this music store available online, CentraSite provides a set of suitable services. The services operate on a common database that includes the required information about the music sheets offered, the customers, and the orders. The services and their usage are exposed to the potential callers.