| Attribute | Type | Description | Required | 
        
          | name | string | The name of the XSLT parameter. | True | 
        
          | value | string | The value of the XSLT parameter. | True | 
        
          | if | bool | Indicates if the parameter should be added to the XSLT argument list. If true then the parameter will be added; otherwise, skipped. The default is true. | False | 
        
          | namespaceuri | string | The namespace URI to associate with the parameter. | False | 
        
          | unless | bool | Indicates if the parameter should not be added to the XSLT argument list. If false then the parameter will be added; otherwise, skipped. The default is false. | False |