---
title: "OperatorSlot"
description: "one slot of an operator"
section: concepts
address: /concepts/operatorslot
contract: 0476e35e6e275db5
---

# OperatorSlot

one slot of an operator

[figure: OperatorSlot is a value at none scope. The drawing shows its fields and the objects that they point at.]

| property | value |
|---|---|
| kind | value |
| scope | none |
| key | none |
| store | none |
| family | rules_engine |



## Fields


| field | type | required | note |
|---|---|---|---|
| `name` | `text` | yes |  |
| `value_type` | `one of text \| number \| time \| duration \| list \| concept \| proxy \| connection kind \| subject \| threshold \| the attribute's own \| range \| choice \| population \| bool \| breadth` | yes | the attribute's own is the type of the attribute compared; a range is two ends of that type, the lower first; a choice is one of the slot's choices; a population names a row of populations; a breadth is one of exact, similar, related or broad, resolved at compile to the leaf's channel bar of the bars of nearness, and a threshold slot beside it is its alternative, exactly one given |
| `required` | `bool` | yes |  |
| `required_when` | `text` | no | the condition under which an optional slot becomes required, in words |
| `choices` | `[text]` | no | for a choice slot, its closed list |
| `whole` | `bool` | no | for a number slot, whether the value must be a whole number |
| `limits` | `[number]` | no | for a number slot, the lowest and the highest value allowed, two numbers |



## Routes that use it
No route takes or returns OperatorSlot directly. The record holds it, and the objects that point at it reach it.