Triple

T28225273

Position	Surface form	Disambiguated ID	Type / Status
Subject	MBTA Red Line at Alewife Station	`E711568`	entity
Predicate	terminusFor	`P388`	FINISHED
Object	MBTA Red Line northwest branch The MBTA Red Line northwest branch is the segment of Boston’s Red Line rapid transit route that runs through Cambridge and Somerville to its northern terminus at Alewife Station.	`E71486`	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 Red Line northwest branch | Statement: [MBTA Red Line at Alewife Station, terminusFor, MBTA Red Line northwest branch]

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: MBTA Red Line northwest branch
Triple: [MBTA Red Line at Alewife Station, terminusFor, MBTA Red Line northwest branch]

Generated description

The MBTA Red Line northwest branch is the segment of Boston’s Red Line rapid transit route that runs through Cambridge and Somerville to its northern terminus at Alewife Station.

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_69efb51dfb048190ada79b745c33b363`	completed	April 27, 2026, 7:12 p.m.
NER	Named-entity recognition	`batch_69f64383a09881908365b967641ab98f`	completed	May 2, 2026, 6:33 p.m.
NED1	Entity disambiguation (via context triple)	`batch_6a1cb6c763ac8190a21341a1619515c3`	completed	May 31, 2026, 10:31 p.m.
NEDg	Description generation	`batch_6a1cb951b5a481908ffb688a5648a664`	completed	May 31, 2026, 10:42 p.m.
NED2	Entity disambiguation (via description)	`batch_6a1cb9c3e8e88190bf5c5955adf18073`	completed	May 31, 2026, 10:44 p.m.

Created at: April 27, 2026, 10:49 p.m.