Triple

T2383531
Position Surface form Disambiguated ID Type / Status
Subject Green Line (MBTA) E46364 entity
Predicate terminus P388 FINISHED
Object Union Square station (Somerville)
Union Square station (Somerville) is an MBTA Green Line light rail station in Somerville, Massachusetts, serving as the line’s northern terminus and a key part of the Green Line Extension project.
 E260828 NE FINISHED

How this triple was built (4 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: Union Square station (Somerville) | Statement: [Green Line (MBTA), terminus, Union Square station (Somerville)]
NED1 Entity disambiguation (via context triple) gpt-5-mini-2025-08-07 
Target entity: Union Square station (Somerville)
Context triple: [Green Line (MBTA), terminus, Union Square station (Somerville)]
  • A. MBTA Silver Hill station
    MBTA Silver Hill station is a small commuter rail stop on the Massachusetts Bay Transportation Authority’s Fitchburg Line serving the Silver Hill neighborhood of Weston, Massachusetts.
  • B. Roxbury Crossing station
    Roxbury Crossing station is an MBTA Orange Line rapid transit stop in Boston, Massachusetts, serving the Mission Hill neighborhood and surrounding areas.
  • C. Melrose Highlands station
    Melrose Highlands station is a commuter rail stop in Melrose, Massachusetts, served by the MBTA on its Haverhill Line.
  • D. Massachusetts Avenue station
    Massachusetts Avenue station is an underground rapid transit stop in Boston, Massachusetts, located in the South End and served by the MBTA's Orange Line.
  • E. Malden Center station
    Malden Center station is a major transit hub in Malden, Massachusetts, serving both MBTA Orange Line subway and commuter rail services.
  • F. None of above. chosen
  • G. Unsure - the case is ambiguous/there is not enough information to decide.
NEDg Description generation gpt-5.1
Instruction
Generate a one-sentence description of the target entity. 
You are given a context triple in the form (subject, predicate, object), where the object is the target entity. 
# Instructions
Use the triple to infer relevant information about the entity. Describe the entity based on what is most defining, well-known. 
Avoid repeating the information from the triple, unless really essential.
# Response Format
Return only the sentence: "Description: [one-sentence description of the target entity]"
Input
Entity: Union Square station (Somerville)
Triple: [Green Line (MBTA), terminus, Union Square station (Somerville)]
Generated description
Union Square station (Somerville) is an MBTA Green Line light rail station in Somerville, Massachusetts, serving as the line’s northern terminus and a key part of the Green Line Extension project.
NED2 Entity disambiguation (via description) gpt-5-mini-2025-08-07 
Target entity: Union Square station (Somerville)
Target entity description: Union Square station (Somerville) is an MBTA Green Line light rail station in Somerville, Massachusetts, serving as the line’s northern terminus and a key part of the Green Line Extension project.
  • A. MBTA Silver Hill station
    MBTA Silver Hill station is a small commuter rail stop on the Massachusetts Bay Transportation Authority’s Fitchburg Line serving the Silver Hill neighborhood of Weston, Massachusetts.
  • B. Roxbury Crossing station
    Roxbury Crossing station is an MBTA Orange Line rapid transit stop in Boston, Massachusetts, serving the Mission Hill neighborhood and surrounding areas.
  • C. Melrose Highlands station
    Melrose Highlands station is a commuter rail stop in Melrose, Massachusetts, served by the MBTA on its Haverhill Line.
  • D. Massachusetts Avenue station
    Massachusetts Avenue station is an underground rapid transit stop in Boston, Massachusetts, located in the South End and served by the MBTA's Orange Line.
  • E. Malden Center station
    Malden Center station is a major transit hub in Malden, Massachusetts, serving both MBTA Orange Line subway and commuter rail services.
  • F. None of above. chosen

Provenance (5 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_69a88a1554a48190a0180682bcf099be completed March 4, 2026, 7:37 p.m.
NER Named-entity recognition batch_69abc7bafa248190a68e8f1e081f4817 completed March 7, 2026, 6:37 a.m.
NED1 Entity disambiguation (via context triple) batch_69aea8b790bc8190ba399e252acec750 completed March 9, 2026, 11:02 a.m.
NEDg Description generation batch_69aeabb22c708190898b44cdd8b97ff6 completed March 9, 2026, 11:14 a.m.
NED2 Entity disambiguation (via description) batch_69aeac141ca88190a9a91d0f5b25c341 completed March 9, 2026, 11:16 a.m.
Created at: March 4, 2026, 7:57 p.m.