Query operation output for quads. For example: SPARQL CONSTRUCT results
The resulting action context.
Callback that returns a promise that resolves to the metadata about the stream. This can contain things like the estimated number of total stream elements, or the order in which the bindings appear. This callback can be invoked multiple times. The actors that return this metadata will make sure that multiple calls properly cache this promise. Metadata will not be collected until this callback is invoked.
The stream of quads.
The type of output.
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