"Information management is a key issue in the construction of grid applications. This usually involves the generation, aggregation and synchronization of information about grid resources for use in resource discovery, selection, and optimization. In the Open Grid Service Architecture (OGSA), everything is represented as a grid service and expresses its state in a standardized way as Service Data Elements (SDEs).
"As the reference implementation of Open Grid Service Infrastructure (OGSI), which forms the foundation of OGSA, Globus Toolkit Version 3.0 (GT3) provides three additional components referred as GT3 Base Services. Information service, implemented as the Index Service, is one of the GT3 Base Services. It provides the functionality within which Service Data can be collected, aggregated, and queried; data feeds can be monitored; and Service Data can be created dynamically on demand. This article focuses on how the Index Service can be used to index grid services, for example, to index Service Data from multiple grid service instances through the subscription and notification interfaces that OGSI has defined..."
