Using SparQL Connection from Postman via Ontop Virtual Knowledge Graph

Intended audience: Developers administrators

AO Platform: 5.0

Overview

This topic provides insight into how to access the AO Platform Semantic Layer using the SparQL interface via Ontop Virtual Knowledge Graph.

Resources

For details about the SparQL Query Language and the Ontology-Based Data Access (OBDA) mapping, please see these resources:

• https://en.wikipedia.org/wiki/SPARQL

• https://w3c.github.io/sparql-query/spec/

• https://ontop-vkg.org/guide/advanced/mapping-language.html

Configuration

• Configure Header (example), including Authorization token.

Use of SparQL Connection to AO Platform

• Execute a SparQL query by using a REST endpoint - /api/ontology/{ontology_uid}/sparql/execute - and return results in multiple formats - ?outputFormat= :

  • SPARQL_JSON (default)

  • RDF_XML

  • OWL

  • JSON

  • TURTLE

• Generate a SparQL query from SQL using Ontology-Based Data Access (OBDA) mapping - in ChatGPT

• Enter the SparQL query in eg. Postman.

  • URL: https://{ao-server}/api/ontology/{ontology_uid}/sparql/execute?outputFormat=OWL

  • Body (raw): full SparQL query

• Copy the outputFormat result to ChatGPT and ask it to generate the graph.

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