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Query Knowledge Graphs in FRINK

FRINK Query Page

FRINK offers a query page that enables anyone to query specific Theme 1 graphs or query across graphs (i.e., a federated query). The FRINK Query Page is located at https://frink.apps.renci.org.

Query Specific Graphs

The query page allows selection of a single knowledge graph or multiple knowledge graphs to query.

From the Sources drop-down menu (shown below)

You can select one or many of the graphs comprising FRINK.

Then you can construct a query in SPARQL using the SPARQL Query pane and run the query against the data sources you selected in the Sources drop down. Click the Run Query button to execute the query.

Query Using Examples

In the EXAMPLES pane, you can select a pre-formulated SPARQL query from the list. The EXAMPLES pane includes queries from distinct Theme 1 graphs as well as from other graphs that are used in the OKN (e.g., Ubergraph), with each example query clearly labeled.

Query Across Graphs

If the you wish to query over all available data sources, select FRINK Federated SPARQL from the Sources drop down. Be sure to deselect all other sources. This will submit the query to a server-side endpoint federating all sources.

Saving Queries and Downloading Output

In the SPARQL Query pane, you can click the Save Query button to save your query. It will appear in the SAVED panel as shown below.

In the RESULTS pane, you can click the blue download button to download the output of your query. The button is circled in red below.

SPARQL Endpoints

FRINK deploys standardized API endpoints for each hosted knowledge graph. Currently FRINK provides the following kinds of APIs:

  • SPARQL: SPARQL is the standard graph querying language for RDF datasets.

  • TPF: TPF (Triple Pattern Fragments) is a low-cost interface to RDF datasets that supports querying a single triple pattern at a time.

The FRINK API endpoints can be used progammatically (see below), or else accessed using the FRINK SPARQL query page, built on the Comunica knowledge graph querying framework.

Theme 1 Specific Endpoints

The following knowledge graphs are currently available within FRINK. The SPARQL endpoints are service endpoints only (no user interface). You can query them via the FRINK query page, or using a third party SPARQL tool such as Yasgui. The TPF endpoints are service endpoints but also provide a browser UI.

  • climatepub4-kg
    • SPARQL: https://frink.apps.renci.org/climatepub4kg/sparql
    • TPF: https://frink.apps.renci.org/ldf/climatepub4kg
  • DREAM-KG
    • SPARQL: https://frink.apps.renci.org/dreamkg/sparql
    • TPF: https://frink.apps.renci.org/ldf/dreamkg
  • FIO-KG
    • SPARQL: https://frink.apps.renci.org/fiokg/sparql
    • TPF: https://frink.apps.renci.org/ldf/fiokg
  • Geoconnex
    • SPARQL: https://frink.apps.renci.org/geoconnex/sparql
    • TPF: https://frink.apps.renci.org/ldf/geoconnex
  • Hydrology KG
    • SPARQL: https://frink.apps.renci.org/hydrologykg/sparql
    • TPF: https://frink.apps.renci.org/ldf/hydrologykg
  • SCALES
    • SPARQL: https://frink.apps.renci.org/scales/sparql
    • TPF: https://frink.apps.renci.org/ldf/scales
  • Secure Chain KG
    • SPARQL: https://frink.apps.renci.org/securechainkg/sparql
    • TPF: https://frink.apps.renci.org/ldf/securechainkg
  • SemOpenAlex (via CollabNext)
    • SPARQL: https://frink.apps.renci.org/semopenalex/sparql
    • TPF: https://frink.apps.renci.org/ldf/semopenalex
  • SOC-KG
    • SPARQL: https://frink.apps.renci.org/sockg/sparql
    • TPF: https://frink.apps.renci.org/ldf/sockg
  • Spatial KG
    • SPARQL: https://frink.apps.renci.org/spatialkg/sparql
    • TPF: https://frink.apps.renci.org/ldf/spatialkg
  • SPOKE-KG
    • SPARQL: https://frink.apps.renci.org/spoke/sparql
    • TPF: https://frink.apps.renci.org/ldf/spoke
  • SUD-OKN
    • SPARQL: https://frink.apps.renci.org/sudokn/sparql
    • TPF: https://frink.apps.renci.org/ldf/sudokn
  • UF-OKN
    • SPARQL: https://frink.apps.renci.org/ufokn/sparql
    • TPF: https://frink.apps.renci.org/ldf/ufokn
  • Ubergraph
    • SPARQL: https://frink.apps.renci.org/ubergraph/sparql
    • TPF: https://frink.apps.renci.org/ldf/ubergraph
  • Wildlife-KG
    • SPARQL: https://frink.apps.renci.org/wildlifekg/sparql
    • TPF: https://frink.apps.renci.org/ldf/wildlifekg
  • Wikidata
    • SPARQL: https://frink.apps.renci.org/wikidata/sparql
    • TPF: https://frink.apps.renci.org/ldf/wikidata

Federated query endpoint

  • SPARQL: https://frink.apps.renci.org/federation/sparql