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::IoTSiteWise::AssetModel AssetModelProperty
<a name="aws-properties-iotsitewise-assetmodel-assetmodelproperty"></a>

Contains information about an asset model property.

## Syntax
<a name="aws-properties-iotsitewise-assetmodel-assetmodelproperty-syntax"></a>

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

### JSON
<a name="aws-properties-iotsitewise-assetmodel-assetmodelproperty-syntax.json"></a>

```
{
  "[DataType](#cfn-iotsitewise-assetmodel-assetmodelproperty-datatype)" : String,
  "[DataTypeSpec](#cfn-iotsitewise-assetmodel-assetmodelproperty-datatypespec)" : String,
  "[ExternalId](#cfn-iotsitewise-assetmodel-assetmodelproperty-externalid)" : String,
  "[Id](#cfn-iotsitewise-assetmodel-assetmodelproperty-id)" : String,
  "[LogicalId](#cfn-iotsitewise-assetmodel-assetmodelproperty-logicalid)" : String,
  "[Name](#cfn-iotsitewise-assetmodel-assetmodelproperty-name)" : String,
  "[Type](#cfn-iotsitewise-assetmodel-assetmodelproperty-type)" : PropertyType,
  "[Unit](#cfn-iotsitewise-assetmodel-assetmodelproperty-unit)" : String
}
```

### YAML
<a name="aws-properties-iotsitewise-assetmodel-assetmodelproperty-syntax.yaml"></a>

```
  [DataType](#cfn-iotsitewise-assetmodel-assetmodelproperty-datatype): String
  [DataTypeSpec](#cfn-iotsitewise-assetmodel-assetmodelproperty-datatypespec): String
  [ExternalId](#cfn-iotsitewise-assetmodel-assetmodelproperty-externalid): String
  [Id](#cfn-iotsitewise-assetmodel-assetmodelproperty-id): String
  [LogicalId](#cfn-iotsitewise-assetmodel-assetmodelproperty-logicalid): String
  [Name](#cfn-iotsitewise-assetmodel-assetmodelproperty-name): String
  [Type](#cfn-iotsitewise-assetmodel-assetmodelproperty-type): 
    PropertyType
  [Unit](#cfn-iotsitewise-assetmodel-assetmodelproperty-unit): String
```

## Properties
<a name="aws-properties-iotsitewise-assetmodel-assetmodelproperty-properties"></a>

`DataType`  <a name="cfn-iotsitewise-assetmodel-assetmodelproperty-datatype"></a>
The data type of the asset model property.  
If you specify `STRUCT`, you must also specify `dataTypeSpec` to identify the type of the structure for this property.  
*Required*: Yes  
*Type*: String  
*Allowed values*: `STRING | INTEGER | DOUBLE | BOOLEAN | STRUCT`  
*Update requires*: [No interruption](https://docs.amazonaws.cn/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-no-interrupt)

`DataTypeSpec`  <a name="cfn-iotsitewise-assetmodel-assetmodelproperty-datatypespec"></a>
The data type of the structure for this property. This parameter exists on properties that have the `STRUCT` data type.  
*Required*: No  
*Type*: String  
*Allowed values*: `AWS/ALARM_STATE`  
*Update requires*: [No interruption](https://docs.amazonaws.cn/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-no-interrupt)

`ExternalId`  <a name="cfn-iotsitewise-assetmodel-assetmodelproperty-externalid"></a>
The external ID of the asset property. For more information, see [Using external IDs](https://docs.amazonaws.cn/iot-sitewise/latest/userguide/object-ids.html#external-ids) in the *Amazon IoT SiteWise User Guide*.  
One of `ExternalId` or `LogicalId` must be specified.
*Required*: No  
*Type*: String  
*Pattern*: `[a-zA-Z0-9_][a-zA-Z_\-0-9.:]*[a-zA-Z0-9_]+`  
*Minimum*: `2`  
*Maximum*: `128`  
*Update requires*: [No interruption](https://docs.amazonaws.cn/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-no-interrupt)

`Id`  <a name="cfn-iotsitewise-assetmodel-assetmodelproperty-id"></a>
The ID of the property.  
This is a return value and can't be set.
*Required*: No  
*Type*: String  
*Pattern*: `^[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}$`  
*Minimum*: `36`  
*Maximum*: `36`  
*Update requires*: [No interruption](https://docs.amazonaws.cn/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-no-interrupt)

`LogicalId`  <a name="cfn-iotsitewise-assetmodel-assetmodelproperty-logicalid"></a>
The `LogicalID` of the asset model property.  
One of `ExternalId` or `LogicalId` must be specified.
*Required*: No  
*Type*: String  
*Pattern*: `[^\u0000-\u001F\u007F]+`  
*Minimum*: `1`  
*Maximum*: `256`  
*Update requires*: [No interruption](https://docs.amazonaws.cn/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-no-interrupt)

`Name`  <a name="cfn-iotsitewise-assetmodel-assetmodelproperty-name"></a>
The name of the asset model property.  
*Required*: Yes  
*Type*: String  
*Update requires*: [No interruption](https://docs.amazonaws.cn/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-no-interrupt)

`Type`  <a name="cfn-iotsitewise-assetmodel-assetmodelproperty-type"></a>
Contains a property type, which can be one of `attribute`, `measurement`, `metric`, or `transform`.  
*Required*: Yes  
*Type*: [PropertyType](aws-properties-iotsitewise-assetmodel-propertytype.md)  
*Update requires*: [No interruption](https://docs.amazonaws.cn/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-no-interrupt)

`Unit`  <a name="cfn-iotsitewise-assetmodel-assetmodelproperty-unit"></a>
The unit of the asset model property, such as `Newtons` or `RPM`.  
*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)