Linked Data Finland
Datasets, Graphs, and Services
A dataset in LDF.fi consists of one or more RDF graphs. The graph URI (GRAPH-URI) of a graph (GRAPH) in a dataset (DATASET) is:
For example: http://ldf.fi/finlex/laki.
Each dataset is associated with a Fuseki SPARQL service that provides the following more specific service URLs
- Download: http://SERVICE/data SPARQL Graph Store Protocol service
- Upload: http://SERVICE/upload Non-SPARQL file upload
- Query: http://SERVICE/sparql SPARQL Query service
- Update: http://SERVICE/update SPARQL Update service
The services can be used with HTTP GET and POST protocols using additional service specific parameters. The SPARQL RDF service description of a service is available at URL:
In below the services are described in more detail.
A graph in a dataset can be downloaded using the HTTP GET/POST pattern:
Fuseki Server Management is used for uploading data into graphs and for some other management tasks. However, using this service is restricted to LDF.fi personnel only.
Each dataset DATASET in LDF.fi has a SPARQL endpoint at the address:
A dataset can be queried by using a SPARQL query QUERY as a GET/POST parameter:
If different datasets are queried at the same time, then federated SPARQL queries must be used. By LDF convention, the union of the graphs of a dataset are available as a nameless default graph, which means that the URIs of the graphs can be used in queries without naming their graphs.
You can investigate datasets by selecting a SPARQL endpoint and submitting a query there.
In addition to SPARQL querying, also SPARQL Update service is supported using HTTP at service URL http://SERVICE/update. However, this service is restricted to LDF.fi maintainers only.