@comunica/actor-rdf-metadata-extract-hydra-pagesize

Comunica Hydra Pagesize RDF Metadata Extract Actor

An RDF Metadata Extract actor that extract page sizes in the Hydra Core vocabulary.

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-rdf-metadata-extract-hydra-pagesize

Metadata entries

This actor adds the following entries to the metadata object.

• pageSize: Value of http://www.w3.org/ns/hydra/core#itemsPerPage.

Configure

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

{
  "@context": [
    ...
    "https://linkedsoftwaredependencies.org/bundles/npm/@comunica/actor-rdf-metadata-extract-hydra-pagesize/^4.0.0/components/context.jsonld"
  ],
  "actors": [
    ...
    {
      "@id": "urn:comunica:default:rdf-metadata-extract/actors#hydra-pagesize",
      "@type": "ActorRdfMetadataExtractHydraPagesize",
      "predicates": [
        "http://www.w3.org/ns/hydra/core#itemsPerPage"
      ]
    }
  ]
}

Config Parameters

• predicates: The predicates to consider when determining page size, defaults to http://www.w3.org/ns/hydra/core#itemsPerPage.

Changelog

v4.0.2 - 2024-10-16

Changed

• Document that algebra inputs should not contain blank nodes, Closes #1234

Fixed

• Fix some zero-or-more path queries producing empty results, Closes #1449

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