The rest of this article is structured as follows: the section "Overview of the Simple Query Interface (SQI)" gives an overview of the main characteristics of the Simple Query Interface.
The Simple Query Interface (SQI) is a standard (3) Application Program Interface (API) for querying heterogeneous learning resource repositories (Simon, Massart, Van Assche, Ternier, & Duval, 2005) (i.e., it covers the first step of the process of obtaining a learning object, previously described).
A legacy system communicates with an adapter using the simple query interface. In turn, the adapter communicates with two elements of the iClass server to which it is connected: the content server and the content distribution system using their respective interfaces.
A simple query interface for interoperable learning repositories.