OBA Sparql Query Manager

OBA Sparql Query Manager is a Python Module to translate CRUD requests to SPARQL queries. This module is used by OBA project to generate a REST API from OWL ontologies.

OBA sparql use JSON-LD contexts to translate RDF triples to JSON, and vice versa.

Quick Start

Generate the context files

Simply speaking, a context is used to map terms to IRIs. Terms are case sensitive and most valid strings that are not reserved JSON-LD keywords can be used as a term.

To generate the context files, we recommend to use:

1. OBA
2. owl2jsonld

TODO: Insert a good example.

from obasparql import QueryManager
from test.settings import dbpedia_queries, dbpedia_context, dbpedia_endpoint, dbpedia_prefix
from obasparql.static import * 
queries = "queries/"
contexts = "contexts/"
dbpedia_endpoint = "https://dbpedia.org/sparql"
dbpedia_prefix = "http://dbpedia.org/resource"
graph = None

query_manager = QueryManager(queries_dir=queries,
                                  context_dir=contexts,
                                  endpoint=dbpedia_endpoint,
                                  named_graph_base=graph,
                                  uri_prefix=dbpedia_prefix)

query_manager.get_one_resource()
query_manager.get_all_resource()

Supported features

OBA sparql supports two types of queries:

• Default queries: queries related to the CRUD requests.
  • Get a resource and get all the resource by type.
• Custom queries: In some cases, users need to implement custom queries that are not the default instances of a class of the ontology (e.g., get all instances of a class that comply with certain conditions)

Default queries

• GET all: Obtain all the resources with a rdf:type. Needs:
  1. Resource Type IRI. (For example: http://dbpedia.org/ontology/Artist)
• GET one: Obtain the details about a resource with the id. Needs:
  1. Resource IRI: (For example: http://dbpedia.org/ontology/Pink_Floyd)
  2. Resource Type IRI: (For example: http://dbpedia.org/ontology/Artist)
• POST: Insert a new resource:
  1. The JSON request
• PUT: Update a existing resource
  1. Resource IRI: (For example: http://dbpedia.org/ontology/Pink_Floyd)
• DELETE: Delete a existing resource
  1. Resource IRI: (For example: http://dbpedia.org/ontology/Pink_Floyd)

Custom queries

• Get all instances of a class that comply with certain conditions
  1. Resource Type IRI: (For example: http://dbpedia.org/ontology/Artist)
• Get one instance of a class that comply with the conditions
  1. Resource IRI: (For example: http://dbpedia.org/ontology/Pink_Floyd)
  2. Resource Type IRI: (For example: http://dbpedia.org/ontology/Artist)

Testing

This repository is using pytest for the testing

$ pip install -r test-requirements.txt
$ pytest

For more information. You can inspect the file .travis.yaml