Triple
T5853194
| Position | Surface form | Disambiguated ID | Type / Status |
|---|---|---|---|
| Subject | Central Avenue station |
E130085
|
entity |
| Predicate | historicalLineName |
P17520
|
FINISHED |
| Object | Ashmont–Mattapan High-Speed Line |
E81387
|
NE FINISHED |
How this triple was built (3 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: Ashmont–Mattapan High-Speed Line | Statement: [Central Avenue station, historicalLineName, Ashmont–Mattapan High-Speed Line]
NED1
Entity disambiguation (via context triple)
gpt-5-mini-2025-08-07
Target entity: Ashmont–Mattapan High-Speed Line Context triple: [Central Avenue station, historicalLineName, Ashmont–Mattapan High-Speed Line]
-
A.
MBTA Mattapan High-Speed Line
chosen
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.
-
B.
MBTA Ashmont Branch
The MBTA Ashmont Branch is a rapid transit line of Boston’s Red Line that runs from JFK/UMass station through Dorchester to Ashmont, serving several southern neighborhoods of the city.
-
C.
Mattapan High-Speed Line
The Mattapan High-Speed Line is a light rail transit line in Boston, Massachusetts, operating historic trolley cars between Ashmont and Mattapan stations as part of the MBTA system.
-
D.
MBTA Needham Line
The MBTA Needham Line is a commuter rail route in the Greater Boston area that connects Boston’s South Station with the suburb of Needham, serving intermediate communities along the way.
-
E.
MBTA Fitchburg Line
The MBTA Fitchburg Line is a commuter rail route in the Greater Boston area that runs between Boston and Fitchburg, serving numerous suburban communities along the way.
- F. None of above.
- G. Unsure - the case is ambiguous/there is not enough information to decide.
PD
Predicate disambiguation
gpt-5-mini-2025-08-07
Target predicate: historicalLineName Context triple: [Central Avenue station, historicalLineName, Ashmont–Mattapan High-Speed Line]
-
A.
formerLineName
chosen
Indicates that the object is a previous or former name by which the referenced line was known.
-
B.
lineName
Indicates the specific name or designation assigned to a particular line (such as a route, path, or service) that distinguishes it from other lines.
-
C.
historicalNameType
Indicates that the relationship specifies the type or category of a historical name associated with an entity.
-
D.
regionHistoricalName
Indicates that a region has been known by a particular historical name during some past period.
-
E.
historicalTerminus
Indicates that one entity serves as the historically recognized endpoint or final limit of another entity, such as a route, period, or process.
- F. None of above.
Provenance (4 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_69c0084de39081909eb34e6bed74215a |
completed | March 22, 2026, 3:18 p.m. |
| NER | Named-entity recognition | batch_69c044ab0a048190b84be40fb13c0f50 |
completed | March 22, 2026, 7:36 p.m. |
| NED1 | Entity disambiguation (via context triple) | batch_69c0b1007bbc81908963d3d14c9210c5 |
completed | March 23, 2026, 3:18 a.m. |
| PD | Predicate disambiguation | batch_69c03345ca0c819081c81148d054fed2 |
completed | March 22, 2026, 6:21 p.m. |
Created at: March 22, 2026, 3:55 p.m.