OptionalallowOptionalbeforeActor that must be registered in the bus before this actor.
The bus this actor subscribes to.
OptionalbusThe message that will be configured in the bus for reporting failures.
This message may be a template string that contains references to the executed action.
For example, the following templated string is allowed:
"RDF dereferencing failed: no actors could handle ${action.handle.mediaType}"
OptionalcontextA JSON string of a query operation context
OptionaldefaultThe default query input format
The HTTP cache invalidation mediator
The query process mediator
The query serialize mediator
The query serialize media type combinator
The query serialize media type format combinator
The name for this actor.
OptionalqueryA SPARQL query string
If it should be allowed that the user passes no sources.