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
Login to test this query using our experimental API explorer
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
This example query will list the name, agency and mass of all spacecraft launched on 16th July 1969. Simply change the date to select launches on an alternate date.
Find the identifier and label for disciplines (subject categories) against which spacecraft launches have been classified.
Lists the identifier, name and URL of an image associated with 100 spacecraft. Adjust the LIMIT to select more or less data, and add an OFFSET to page through the dataset.
Note: As not all spacecraft have images associated with them, an OPTIONAL clause is used to find those properties.
Generates descriptions of all spacecraft launched on 16th July 1969. Adjust the date to describe data on a different date.
DESCRIBE ?prop {
?subject ?prop ?object
}
