Triple
T1721022
| Position | Surface form | Disambiguated ID | Type / Status |
|---|---|---|---|
| Subject | Braintree station |
E37388
|
entity |
| Predicate | partOf |
P40
|
FINISHED |
| Object | MBTA rapid transit system |
E2866
|
NE FINISHED |
How this triple was built (2 steps)
Every LLM step that produced this triple, in pipeline order — named-entity classification, the disambiguation choices (the exact options shown, with the pick highlighted), and the generated description. The batch + timestamp of each is in the Provenance table below.
NER
Named-entity recognition
gpt-5-mini
Instruction
Given a phrase, classify it is english named entity (e.g., persons, organizations, works of art) in Latin script, or not (e.g., literals, dates, URLs, verbose phrases). For disambiguation, the statement where the phrase occurs as object is also given. Please return a JSON object with `phrase` (string, the phrase being analyzed) and `is_ne` (boolean, indicating whether the phrase is a Named Entity).
Input
Phrase: MBTA rapid transit system | Statement: [Braintree station, partOf, MBTA rapid transit system]
NED1
Entity disambiguation (via context triple)
gpt-5-mini-2025-08-07
Target entity: MBTA rapid transit system Context triple: [Braintree station, partOf, MBTA rapid transit system]
-
A.
MBTA Commuter Rail network
The MBTA Commuter Rail network is a regional passenger rail system serving Greater Boston and surrounding communities in Massachusetts and parts of Rhode Island.
-
B.
MBTA
chosen
The MBTA (Massachusetts Bay Transportation Authority) is the public transit agency that operates subway, bus, commuter rail, and ferry services in the Greater Boston area.
-
C.
MBTA
MBTA is a landmark U.S. federal law enacted in 1918 that protects migratory bird species by prohibiting their unauthorized capture, killing, or trade.
-
D.
MBTA Green Line
The MBTA Green Line is a light rail service in Boston, Massachusetts, known as one of the oldest subway lines in the United States and serving key neighborhoods, universities, and cultural destinations across the city.
-
E.
MBTA Mattapan High-Speed Line
The MBTA Mattapan High-Speed Line is a light rail trolley service in the Boston area that operates historic PCC streetcars between Ashmont Station in Dorchester and Mattapan, serving communities including Milton, Massachusetts.
- F. None of above.
- G. Unsure - the case is ambiguous/there is not enough information to decide.
Provenance (3 batches)
The batch behind each pipeline step, in order, with when it ran. Timestamps are batch-level — stages were processed in waves, so the object chain (NER → NED1 → NEDg → NED2) reads in order, but predicate / elicitation batches can sit in a different wave.
| Step | Stage | Batch ID | Status | When |
|---|---|---|---|---|
| creating | Elicitation | batch_69a8861912dc8190931af43b4b9158a7 |
completed | March 4, 2026, 7:20 p.m. |
| NER | Named-entity recognition | batch_69aa63558d7c8190830cb8ee2e4a8932 |
completed | March 6, 2026, 5:17 a.m. |
| NED1 | Entity disambiguation (via context triple) | batch_69b261a163a08190bd5bdb95725e4072 |
completed | March 12, 2026, 6:48 a.m. |
Created at: March 4, 2026, 7:30 p.m.