Comunica Expressions Init Actor

An Init actor that exposes the mediators needed to evaluate SPARQL expressions, which ExpressionEngineBase wraps into an IExpressionEngine.

This module is part of the Comunica framework, and should only be used by developers that want to build their own query engine.

Click here if you just want to query with Comunica.

Install

$ yarn add @comunica/actor-init-expressions
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Configure

After installing, this package can be added to your engine's configuration as follows:

{
  "@context": [
    ...
    "https://linkedsoftwaredependencies.org/bundles/npm/@comunica/actor-init-expressions/^5.0.0/components/context.jsonld"
  ],
  "actors": [
    ...
    {
      "@id": "urn:comunica:default:init/actors#expressions",
      "@type": "ActorInitExpressions",
      "mediatorExpressionEvaluatorFactory": { "@id": "urn:comunica:default:expression-evaluator-factory/mediators#main" },
      "mediatorTermComparatorFactory": { "@id": "urn:comunica:default:term-comparator-factory/mediators#main" },
      "mediatorBindingsAggregatorFactory": { "@id": "urn:comunica:default:bindings-aggregator-factory/mediators#main" }
    }
  ]
}
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Config Parameters

• mediatorExpressionEvaluatorFactory: A mediator over the expression evaluator factory bus.
• mediatorTermComparatorFactory: A mediator over the term comparator factory bus.
• mediatorBindingsAggregatorFactory: A mediator over the bindings aggregator factory bus.