Chimera is a system used to find or create a workflow for a series of
OGSA Grid services to provide a scientists requested data product. Chimera was begun in 1999 and is enabled by the
Pegasus Planner described in [deelman02b], a
GriPhyN project at UC ISI. The Chimera is middleware designed to be invisible from a client who requests the data product. The workflow is represented as an
abstract program execution graph (DAX - DAG in XML). This graph is transformed into an executable
DAG for the Condor
DAGman scheduler by the
Pegasus planner.
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