sparql_protocol plugin reads data from SPARQL endpoints. It also implements writing to endpoints using SPARQL-Update language. This plugin is known to work with endpoints supplied by OpenLink Virtuoso and 4store. It currently cannot access endpoints that require authorization.
SPARQLWrapper library is used for actually making requests and converting data from and to Python structures.
| Parameter | Default Value | Description |
|---|---|---|
| endpoint | None | Address of SPARQL HTTP endpoint. |
| default_context | None | The default context (graph) to be queried against (this is useful in particular for the Virtuoso RDF store). |
| combine_queries | None | whether multiple SPARUL queries can be sent in one request |
| use_subqueries | None | whether use of SPARQL 1.1 subqueries and SELECT expressions is allowed (whether SPARQL endpoint supports that) |
| use_keepalive | False | whether to use HTTP 1.1 keep-alive connections. |
The parameters are passed as key-value arguments to the surf.store.Store class:
s = Store( reader = "sparql_protocol",
writer = "sparql_protocol",
endpoint = "http://dbpedia.org/sparql",
default_graph = "http://dbpedia.org")