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The following guides explore some of the more advanced concepts when querying using Comunica.
HTTP Basic Authentication
Send authenticated HTTP requests by including username and password.
When remote sources are requested, caching allows them to be reused in the future.
Passing a context
A context can be passed to a query engine to tweak its runtime settings.
Query over the union of data within any number of sources
Using the power of JSON-LD contexts, GraphQL queries can be executed by Comunica
HDT offers highly compressed immutable RDF storage.
Loggers can be set to different logging levels to inspect what Comunica is doing behind the scenes.
Using the Memento protocol, time travel queries can be executed.
All HTTP requests can optionally go through a proxy.
Querying over RDF/JS sources
Query results can be serialized in different formats.
Solid – the Web-based decentralization ecosystem – can be queried with Comunica.
Comunica detects and handles different types of sources.
SPARQL query types
Different SPARQL query types are possible, such as SELECT, CONSTRUCT, ASK, ...
Comunica supports several RDF-related specifications