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# AWS::IoTEvents::DetectorModel DetectorModelDefinition
<a name="aws-properties-iotevents-detectormodel-detectormodeldefinition"></a>

Information that defines how a detector operates.

## Syntax
<a name="aws-properties-iotevents-detectormodel-detectormodeldefinition-syntax"></a>

To declare this entity in your CloudFormation template, use the following syntax:

### JSON
<a name="aws-properties-iotevents-detectormodel-detectormodeldefinition-syntax.json"></a>

```
{
  "[InitialStateName](#cfn-iotevents-detectormodel-detectormodeldefinition-initialstatename)" : {{String}},
  "[States](#cfn-iotevents-detectormodel-detectormodeldefinition-states)" : {{[ State, ... ]}}
}
```

### YAML
<a name="aws-properties-iotevents-detectormodel-detectormodeldefinition-syntax.yaml"></a>

```
  [InitialStateName](#cfn-iotevents-detectormodel-detectormodeldefinition-initialstatename): {{String}}
  [States](#cfn-iotevents-detectormodel-detectormodeldefinition-states): {{
    - State}}
```

## Properties
<a name="aws-properties-iotevents-detectormodel-detectormodeldefinition-properties"></a>

`InitialStateName`  <a name="cfn-iotevents-detectormodel-detectormodeldefinition-initialstatename"></a>
The state that is entered at the creation of each detector (instance).  
*Required*: Yes  
*Type*: String  
*Minimum*: `1`  
*Maximum*: `128`  
*Update requires*: [No interruption](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-no-interrupt)

`States`  <a name="cfn-iotevents-detectormodel-detectormodeldefinition-states"></a>
Information about the states of the detector.  
*Required*: Yes  
*Type*: Array of [State](aws-properties-iotevents-detectormodel-state.md)  
*Minimum*: `1`  
*Update requires*: [No interruption](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-no-interrupt)