Triple

T7567163
Position Surface form Disambiguated ID Type / Status
Subject Keio railway network E178944 entity
Predicate partOf P40 FINISHED
Object Greater Tokyo rail network E173398 NE FINISHED

Named-entity recognition

Before disambiguation, gpt-5-mini classified whether the object phrase is a named entity — the step behind the object's NE type shown above.

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: Greater Tokyo rail network | Statement: [Keio railway network, partOf, Greater Tokyo rail network]

Disambiguation candidates (1 decision)

The exact options the model was shown at each disambiguation step, with the option it chose highlighted — the evidence behind this triple's disambiguated ids.

NED1 Entity disambiguation (via context triple) gpt-5-mini-2025-08-07 
Target entity: Greater Tokyo rail network
Context triple: [Keio railway network, partOf, Greater Tokyo rail network]
  • A. Tokyo metropolitan rail network chosen
    The Tokyo metropolitan rail network is an extensive, high-frequency urban and suburban railway system in Greater Tokyo, renowned for its punctuality, complexity, and integration of multiple private and public rail operators.
  • B. JR Tōzai Line urban network
    The JR Tōzai Line urban network is a commuter rail system in the Kansai region of Japan that connects central Osaka with surrounding areas via the JR Tōzai Line.
  • C. Tokyu railway network
    The Tokyu railway network is a major private rail system in the Greater Tokyo area, operated by Tokyu Corporation and serving key suburban and urban corridors including central hubs like Shibuya.
  • D. JR East urban network
    The JR East urban network is a dense system of commuter and suburban railway lines in the Greater Tokyo and surrounding metropolitan areas operated by East Japan Railway Company (JR East).
  • E. Keio railway network
    The Keio railway network is a private railway system in the Tokyo metropolitan area operated by Keio Corporation, linking central Tokyo with its western suburbs through multiple commuter lines.
  • F. None of above.
  • G. Unsure - the case is ambiguous/there is not enough information to decide.

Provenance (3 batches)

Stage Batch ID Job type Status
creating batch_69c69f2f80288190b95cceb4da92ab2b elicitation completed
NER batch_69c6f91c717881909c88901cc3b101c7 ner completed
NED1 batch_69c856e0c23481908fc59ecc318840ba ned_source_triple completed
Created at: March 27, 2026, 3:50 p.m.