@comunica/actor-rdf-metadata-extract-hydra-count v3.0.3
Comunica Hydra Count RDF Metadata Extract Actor
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.
Install
$ yarn add @comunica/actor-rdf-metadata-extract-hydra-count
Metadata entries
This actor adds the following entries to the metadata object.
cardinality
: Value ofhttp://www.w3.org/ns/hydra/core#totalItems
orhttp://rdfs.org/ns/void#triples
represented as{ type: 'exact' | 'estimate', value: number }
.
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-count/^3.0.0/components/context.jsonld"
],
"actors": [
...
{
"@id": "urn:comunica:default:rdf-metadata-extract/actors#hydra-count",
"@type": "ActorRdfMetadataExtractHydraCount",
"predicates": [
"http://www.w3.org/ns/hydra/core#totalItems",
"http://rdfs.org/ns/void#triples"
]
}
]
}
Config Parameters
predicate
: The predicates to consider when determining counts, defaults tohttp://www.w3.org/ns/hydra/core#totalItems
andhttp://rdfs.org/ns/void#triples
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