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::Omics::WorkflowVersion WorkflowParameter
<a name="aws-properties-omics-workflowversion-workflowparameter"></a>

A workflow parameter.

## Syntax
<a name="aws-properties-omics-workflowversion-workflowparameter-syntax"></a>

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

### JSON
<a name="aws-properties-omics-workflowversion-workflowparameter-syntax.json"></a>

```
{
  "[Description](#cfn-omics-workflowversion-workflowparameter-description)" : {{String}},
  "[Optional](#cfn-omics-workflowversion-workflowparameter-optional)" : {{Boolean}}
}
```

### YAML
<a name="aws-properties-omics-workflowversion-workflowparameter-syntax.yaml"></a>

```
  [Description](#cfn-omics-workflowversion-workflowparameter-description): {{String}}
  [Optional](#cfn-omics-workflowversion-workflowparameter-optional): {{Boolean}}
```

## Properties
<a name="aws-properties-omics-workflowversion-workflowparameter-properties"></a>

`Description`  <a name="cfn-omics-workflowversion-workflowparameter-description"></a>
The parameter's description.  
*Required*: No  
*Type*: String  
*Pattern*: `^[\p{L}||\p{M}||\p{Z}||\p{S}||\p{N}||\p{P}]+$`  
*Minimum*: `0`  
*Maximum*: `256`  
*Update requires*: [Replacement](https://docs.amazonaws.cn/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-replacement)

`Optional`  <a name="cfn-omics-workflowversion-workflowparameter-optional"></a>
Whether the parameter is optional.  
*Required*: No  
*Type*: Boolean  
*Update requires*: [Replacement](https://docs.amazonaws.cn/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-replacement)