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properties/measurement

property token a chosen word

portafilter size

The portafilter/basket diameter — a token from PortafilterSizes. Optional: a semi-automatic machine states it (54 mm Breville, 58 mm Gaggia), but a super-automatic bean-to-cup brews from an internal group with no portafilter and leaves it empty (so it is not required, by L4/A3). Homes on EspressoMachine.

Portafilter size is answered with one word chosen from the portafilter sizes list — the same word shared across every product that uses it.

It belongs to measurement — its measurable, physical facts.

asked by the kinds that answer it

1 kind answers it, each for a single value. The same question can be reused by unrelated kinds — one meaning, many homes.

answered with
token — a token — a word chosen from a fixed vocabulary, shared and filterable across products.
value domain
Portafilter sizes — the vocabulary its answers are drawn from.
concern
Measurement — the facet of a product it belongs to.

asked by kinds that answer it

The same question can be reused by unrelated kinds — one meaning, many homes.

kindhow many
espresso machine one