SPARQL Endpoint
Use the SPARQL 1.1 query language to perform structured queries against a dataset. Useful for performing precise queries against a dataset whose structure you understand.
Table of contents
Endpoint URL
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Authentication
You will need your API key (on your dashboard) in order to authenticate to this API. You have two options for authentication:
- By URL Parameter -- add the
apikeyparameter to your request URL, with your key as the value - By Request Header -- add a custom HTTP header called
X_KASABI_APIKEYto your HTTP request, with your key as the value
For more information on Kasabi authentication options read the authentication documentation. Your API key will need to be authorized to use this service.
Parameters
This API supports the following request parameters:
| Parameter Name | Parameter Value(s) | Required? | Notes |
|---|---|---|---|
query | URL encoded SPARQL query | Yes | This is the query to execute against the dataset |
output | Short name for desired response format | No | Supports selecting response format using url parameter rather than HTTP Accept header. |
HTTP Response Codes
Clients should be prepared to receive any valid HTTP response code. The following table lists the most frequently used codes
| Code | Meaning |
|---|---|
200 OK | Successful Request |
400 Bad Request | Missing or malformed SPARQL query |
401 Not Authorized | API key is not authorized to access the data |
Please also review our additional notes on response codes.
Response Formats
| Query Type | Response Format | Accept Header | output parameter | Notes |
|---|---|---|---|---|
| SELECT or ASK | application/sparql-results+json | application/sparql-results+json | json | Return results in SPARQL JSON results format |
| SELECT or ASK | application/sparql-results+xml | application/sparql-results+json | xml | Return results in SPARQL XML results format |
| CONSTRUCT or DESCRIBE | application/rdf | application/rdf | rdf (or xml) | Return results as RDF/XML |
| CONSTRUCT or DESCRIBE | application/rdf | application/rdf | rdf (or xml) | Return results as RDF/XML |
| CONSTRUCT or DESCRIBE | application/json | application/json | json | Return results as RDF/JSON |
| CONSTRUCT or DESCRIBE | text/turtle | text/turtle | turtle | Return results as Turtle |
| CONSTRUCT or DESCRIBE | text/plain | text/plain | ntriples | Return results as NTriples |
Sample Queries
Look up listed buildings with grade listing and geo (lat/long) data, filtered informally down to a list of churches based on a heuristic applied to description element (that is, description starts: "Church of"). Search limited to 10 results.
select *prefix eh: <http://data.kasabi.com/dataset/english-heritage/def/> prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> prefix geo: <http://www.w3.org/2003/01/geo/wgs84_pos#>
