A hydra-count rdf-metadata-extract actor


221861.22.02 months ago4 years agoMinified + gzip package size for @comunica/actor-rdf-metadata-extract-hydra-count in KB


Comunica Hydra Count RDF Metadata Extract Actor

npm version

An RDF Metadata Extract actor that extract estimated counts in the Hydra Core vocabulary and VoID.

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.


$ yarn add @comunica/actor-rdf-metadata-extract-hydra-count

Metadata entries

This actor adds the following entries to the metadata object.

  • totalItems: Value of http://www.w3.org/ns/hydra/core#totalItems or http://rdfs.org/ns/void#triples.


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

  "@context": [
  "actors": [
      "@id": "config-sets:resolve-hypermedia.json#myRdfMetadataExtractHydraCount",
      "@type": "ActorRdfMetadataExtractHydraCount",
      "carmehco:Actor/RdfMetadataExtract/HydraCount/predicate": [

Config Parameters

  • carmehco:Actor/RdfMetadataExtract/HydraCount/predicate: The predicates to consider when determining counts, defaults to http://www.w3.org/ns/hydra/core#totalItems and http://rdfs.org/ns/void#triples.

If you find any bugs or have a feature request, please open an issue on github!

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