A single few-shot example: a sample text paired with the extractions expected from it.

The extractions are the answer key for the sample text. They pin down everything the template description leaves open: the class vocabulary, the span granularity, which attributes to attach, and the output shape itself — the class name becomes the JSON key in the model's reply.

Each extraction's text must appear verbatim in this example's text: examples double as alignment ground truth, and LangExtract.template!/2 checks this at construction.