Triple

T7996237
Position Surface form Disambiguated ID Type / Status
Subject Taf Fawr E186132 entity
Predicate hasReservoir P1025 FINISHED
Object Llwyn-on Reservoir
Llwyn-on Reservoir is a large man-made lake in the Brecon Beacons area of South Wales that supplies drinking water and supports recreation and wildlife habitats.
 E707950 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: Llwyn-on Reservoir | Statement: [Taf Fawr, hasReservoir, Llwyn-on Reservoir]

Disambiguation candidates (2 decisions)

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: Llwyn-on Reservoir
Context triple: [Taf Fawr, hasReservoir, Llwyn-on Reservoir]
  • A. Claerwen Reservoir
    Claerwen Reservoir is a large upland water reservoir in mid Wales, known for its impressive dam and scenic surroundings within the Elan Valley.
  • B. Pen-y-garreg Reservoir
    Pen-y-garreg Reservoir is a scenic man-made lake in the Elan Valley of mid Wales, known for its historic stone dam and role in the region’s water supply system.
  • C. Clywedog Reservoir
    Clywedog Reservoir is a large man-made lake in mid-Wales, created for water regulation and recreation amid scenic upland surroundings.
  • D. Cantref Reservoir
    Cantref Reservoir is a man-made lake in the Brecon Beacons of South Wales that forms part of the water supply system for the city of Cardiff.
  • E. Garreg Ddu Reservoir
    Garreg Ddu Reservoir is a scenic man-made lake in the Elan Valley of mid-Wales, known for its distinctive submerged dam and role in supplying water to the city of Birmingham.
  • F. None of above. chosen
  • G. Unsure - the case is ambiguous/there is not enough information to decide.
NED2 Entity disambiguation (via description) gpt-5-mini-2025-08-07 
Target entity: Llwyn-on Reservoir
Target entity description: Llwyn-on Reservoir is a large man-made lake in the Brecon Beacons area of South Wales that supplies drinking water and supports recreation and wildlife habitats.
  • A. Claerwen Reservoir
    Claerwen Reservoir is a large upland water reservoir in mid Wales, known for its impressive dam and scenic surroundings within the Elan Valley.
  • B. Pen-y-garreg Reservoir
    Pen-y-garreg Reservoir is a scenic man-made lake in the Elan Valley of mid Wales, known for its historic stone dam and role in the region’s water supply system.
  • C. Clywedog Reservoir
    Clywedog Reservoir is a large man-made lake in mid-Wales, created for water regulation and recreation amid scenic upland surroundings.
  • D. Cantref Reservoir chosen
    Cantref Reservoir is a man-made lake in the Brecon Beacons of South Wales that forms part of the water supply system for the city of Cardiff.
  • E. Garreg Ddu Reservoir
    Garreg Ddu Reservoir is a scenic man-made lake in the Elan Valley of mid-Wales, known for its distinctive submerged dam and role in supplying water to the city of Birmingham.
  • F. None of above.

How the object was described

The object's one-sentence description was generated by prompting gpt-5.1 with the object name and this triple as context.

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: Llwyn-on Reservoir
Triple: [Taf Fawr, hasReservoir, Llwyn-on Reservoir]
Generated description
Llwyn-on Reservoir is a large man-made lake in the Brecon Beacons area of South Wales that supplies drinking water and supports recreation and wildlife habitats.

Provenance (5 batches)

Stage Batch ID Job type Status
creating batch_69ca829c6c308190ab05b43d234c52b2 elicitation completed
NER batch_69cb3c97968481908d261b3f0bd6b8e6 ner completed
NED1 batch_69cc63bcae048190a3fd151b2d8f9f77 ned_source_triple completed
NED2 batch_69cc66b0e1548190840e4335ff2b130f ned_description completed
NEDg batch_69cc64bd6a088190b77e2709c76579e4 nedg completed
Created at: March 30, 2026, 5:17 p.m.