Entity

A concrete NAMED thing in the topic's world — a person, software, a place, an organisation. Reserved: never a catch-all.

An entity is a unit of knowledge that is a noun and an actual, named instance of something: a person, a piece of software, a tool, an organisation, a file format, a place. If you can point at it and it has a proper name, it can be an entity.

Entities are reserved for such concrete things — they are not a home for whatever doesn't obviously fit elsewhere. An idea or behaviour is a concept; a value or lookup table is a fact; a task with steps is a process. When you are tempted to file something as an entity, run it through the decision guide first.

Every entity carries a kind from the closed vocabulary in schema/kinds.wcl (:person, :software, :tool, :organization, :file_format, …). The vocabulary is topic-extensible — append a new kind there when your topic genuinely needs one — but if no kind fits and none is worth adding, the note is not an entity.

An entity's body typically holds a short description plus an attribute table (name, role, version, where to get it). Detail that is really about *understanding* belongs in a linked concept, not inside the entity.