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::Bedrock::AutomatedReasoningPolicy PolicyDefinitionRule
<a name="aws-properties-bedrock-automatedreasoningpolicy-policydefinitionrule"></a>

A rule within the policy definition that defines logical constraints.

## Syntax
<a name="aws-properties-bedrock-automatedreasoningpolicy-policydefinitionrule-syntax"></a>

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

### JSON
<a name="aws-properties-bedrock-automatedreasoningpolicy-policydefinitionrule-syntax.json"></a>

```
{
  "[AlternateExpression](#cfn-bedrock-automatedreasoningpolicy-policydefinitionrule-alternateexpression)" : {{String}},
  "[Expression](#cfn-bedrock-automatedreasoningpolicy-policydefinitionrule-expression)" : {{String}},
  "[Id](#cfn-bedrock-automatedreasoningpolicy-policydefinitionrule-id)" : {{String}}
}
```

### YAML
<a name="aws-properties-bedrock-automatedreasoningpolicy-policydefinitionrule-syntax.yaml"></a>

```
  [AlternateExpression](#cfn-bedrock-automatedreasoningpolicy-policydefinitionrule-alternateexpression): {{String}}
  [Expression](#cfn-bedrock-automatedreasoningpolicy-policydefinitionrule-expression): {{String}}
  [Id](#cfn-bedrock-automatedreasoningpolicy-policydefinitionrule-id): {{String}}
```

## Properties
<a name="aws-properties-bedrock-automatedreasoningpolicy-policydefinitionrule-properties"></a>

`AlternateExpression`  <a name="cfn-bedrock-automatedreasoningpolicy-policydefinitionrule-alternateexpression"></a>
An alternative expression for the policy rule.  
*Required*: No  
*Type*: String  
*Pattern*: `^[\s\S]+$`  
*Maximum*: `2048`  
*Update requires*: [No interruption](https://docs.amazonaws.cn/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-no-interrupt)

`Expression`  <a name="cfn-bedrock-automatedreasoningpolicy-policydefinitionrule-expression"></a>
The logical expression that defines the rule.  
*Required*: Yes  
*Type*: String  
*Pattern*: `^[\s\S]+$`  
*Maximum*: `2048`  
*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-bedrock-automatedreasoningpolicy-policydefinitionrule-id"></a>
The unique identifier for the policy definition rule.  
*Required*: Yes  
*Type*: String  
*Pattern*: `^[A-Z][0-9A-Z]{11}$`  
*Minimum*: `12`  
*Maximum*: `12`  
*Update requires*: [No interruption](https://docs.amazonaws.cn/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-no-interrupt)