Knowledge Graph Fragments

View JSON

Query federated RDF knowledge graphs at bounded cost — from a browser, curl, or an agent, at the same URLs.

47datasets
16.4 Btriples
1protocol

Datasets

Using this service

Every dataset page lists its releases; a release's manifest page carries runnable query forms, its prefixes, and its capabilities. The same URLs answer JSON — with $KGF as this server's base URL:

curl "$KGF/"                                # this catalog
curl "$KGF/babel"                        # release history
curl "$KGF/babel/latest/fragment?limit=25" # one page of triples

Implementation

kgf
0.4.0
protocol
1

Request caps

Requests above these published caps are refused, never silently reduced.

max_limit
10 000
default_limit
100
max_sample
1 000
max_bindings
1 000
max_star_subjects
1 000
max_star_width
32
max_search_predicates
128
max_search_results
1 000
max_label_iris
10 000
max_label_languages
16
max_label_predicates
16
max_verbalize_roots
100
max_schema_items
1 000

Response budgets

Exhausting a budget produces an explicitly incomplete response with a reason.

max_output_rows
100 000
max_output_terms
1 000 000
max_response_bytes
67 108 864
max_request_bytes
1 048 576
max_term_bytes
65 536
candidate_budget
1 000 000
time_budget_ms
2 000