This is the new *Amazon CloudFormation Template Reference Guide*. Please update your bookmarks and links. For help getting started with CloudFormation, see the [Amazon CloudFormation User Guide](https://docs.amazonaws.cn/AWSCloudFormation/latest/UserGuide/Welcome.html).

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

A structure that contains value information. For more information, see [AssetPropertyValue](https://docs.amazonaws.cn/iot-sitewise/latest/APIReference/API_AssetPropertyValue.html) in the *Amazon IoT SiteWise API Reference*.

You must use expressions for all parameters in `AssetPropertyValue`. The expressions accept literals, operators, functions, references, and substitution templates.

**Examples**
+ For literal values, the expressions must contain single quotes. For example, the value for the `quality` parameter can be `'GOOD'`.
+ For references, you must specify either variables or input values. For example, the value for the `quality` parameter can be `$input.TemperatureInput.sensorData.quality`.

For more information, see [Expressions](https://docs.amazonaws.cn/iotevents/latest/developerguide/iotevents-expressions.html) in the *Amazon IoT Events Developer Guide*.

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

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

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

```
{
  "[Quality](#cfn-iotevents-detectormodel-assetpropertyvalue-quality)" : {{String}},
  "[Timestamp](#cfn-iotevents-detectormodel-assetpropertyvalue-timestamp)" : {{AssetPropertyTimestamp}},
  "[Value](#cfn-iotevents-detectormodel-assetpropertyvalue-value)" : {{AssetPropertyVariant}}
}
```

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

```
  [Quality](#cfn-iotevents-detectormodel-assetpropertyvalue-quality): {{String}}
  [Timestamp](#cfn-iotevents-detectormodel-assetpropertyvalue-timestamp): {{
    AssetPropertyTimestamp}}
  [Value](#cfn-iotevents-detectormodel-assetpropertyvalue-value): {{
    AssetPropertyVariant}}
```

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

`Quality`  <a name="cfn-iotevents-detectormodel-assetpropertyvalue-quality"></a>
The quality of the asset property value. The value must be `'GOOD'`, `'BAD'`, or `'UNCERTAIN'`.  
*Required*: No  
*Type*: String  
*Update requires*: [No interruption](https://docs.amazonaws.cn/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-no-interrupt)

`Timestamp`  <a name="cfn-iotevents-detectormodel-assetpropertyvalue-timestamp"></a>
The timestamp associated with the asset property value. The default is the current event time.  
*Required*: No  
*Type*: [AssetPropertyTimestamp](aws-properties-iotevents-detectormodel-assetpropertytimestamp.md)  
*Update requires*: [No interruption](https://docs.amazonaws.cn/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-no-interrupt)

`Value`  <a name="cfn-iotevents-detectormodel-assetpropertyvalue-value"></a>
The value to send to an asset property.  
*Required*: Yes  
*Type*: [AssetPropertyVariant](aws-properties-iotevents-detectormodel-assetpropertyvariant.md)  
*Update requires*: [No interruption](https://docs.amazonaws.cn/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-no-interrupt)