Base execution environment which provides persistent state maintenance.
Mechanism for locating Ninja services via Multicast packets
Database for searching and matching XML descriptions.
Set of operators chained together via connectors.
Data transformer or producer, with well-defined input and output semantics.
Stream-based protocol for communicating between two operators. Imposes no structure on data.
Path with named operators whose inputs and output match, but without specific machines for those operators to run on.
Logical path with specific machines chosen for each operator.
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