# CreateLFTagExpression
<a name="API_CreateLFTagExpression"></a>

Creates a new LF-Tag expression with the provided name, description, catalog ID, and expression body. This call fails if a LF-Tag expression with the same name already exists in the caller’s account or if the underlying LF-Tags don't exist. To call this API operation, caller needs the following Lake Formation permissions:

 `CREATE_LF_TAG_EXPRESSION` on the root catalog resource.

 `GRANT_WITH_LF_TAG_EXPRESSION` on all underlying LF-Tag key:value pairs included in the expression. 

## Request Syntax
<a name="API_CreateLFTagExpression_RequestSyntax"></a>

```
POST /CreateLFTagExpression HTTP/1.1
Content-type: application/json

{
   "CatalogId": "{{string}}",
   "Description": "{{string}}",
   "Expression": [ 
      { 
         "TagKey": "{{string}}",
         "TagValues": [ "{{string}}" ]
      }
   ],
   "Name": "{{string}}"
}
```

## URI Request Parameters
<a name="API_CreateLFTagExpression_RequestParameters"></a>

The request does not use any URI parameters.

## Request Body
<a name="API_CreateLFTagExpression_RequestBody"></a>

The request accepts the following data in JSON format.

 ** [CatalogId](#API_CreateLFTagExpression_RequestSyntax) **   <a name="lakeformation-CreateLFTagExpression-request-CatalogId"></a>
The identifier for the Data Catalog. By default, the account ID. The Data Catalog is the persistent metadata store. It contains database definitions, table definitions, and other control information to manage your Amazon Lake Formation environment.   
Type: String  
Length Constraints: Minimum length of 1. Maximum length of 255.  
Pattern: `[\u0020-\uD7FF\uE000-\uFFFD\uD800\uDC00-\uDBFF\uDFFF\t]*`   
Required: No

 ** [Description](#API_CreateLFTagExpression_RequestSyntax) **   <a name="lakeformation-CreateLFTagExpression-request-Description"></a>
A description with information about the LF-Tag expression.  
Type: String  
Length Constraints: Minimum length of 0. Maximum length of 2048.  
Pattern: `[\u0020-\uD7FF\uE000-\uFFFD\uD800\uDC00-\uDBFF\uDFFF\r\n\t]*`   
Required: No

 ** [Expression](#API_CreateLFTagExpression_RequestSyntax) **   <a name="lakeformation-CreateLFTagExpression-request-Expression"></a>
A list of LF-Tag conditions (key-value pairs).  
Type: Array of [LFTag](API_LFTag.md) objects  
Required: Yes

 ** [Name](#API_CreateLFTagExpression_RequestSyntax) **   <a name="lakeformation-CreateLFTagExpression-request-Name"></a>
A name for the expression.  
Type: String  
Length Constraints: Minimum length of 1. Maximum length of 255.  
Pattern: `[\u0020-\uD7FF\uE000-\uFFFD\uD800\uDC00-\uDBFF\uDFFF\t]*`   
Required: Yes

## Response Syntax
<a name="API_CreateLFTagExpression_ResponseSyntax"></a>

```
HTTP/1.1 200
```

## Response Elements
<a name="API_CreateLFTagExpression_ResponseElements"></a>

If the action is successful, the service sends back an HTTP 200 response with an empty HTTP body.

## Errors
<a name="API_CreateLFTagExpression_Errors"></a>

For information about the errors that are common to all actions, see [Common Error Types](CommonErrors.md).

 ** AccessDeniedException **   
Access to a resource was denied.    
 ** Message **   
A message describing the problem.
HTTP Status Code: 403

 ** EntityNotFoundException **   
A specified entity does not exist.    
 ** Message **   
A message describing the problem.
HTTP Status Code: 400

 ** InternalServiceException **   
An internal service error occurred.    
 ** Message **   
A message describing the problem.
HTTP Status Code: 500

 ** InvalidInputException **   
The input provided was not valid.    
 ** Message **   
A message describing the problem.
HTTP Status Code: 400

 ** OperationTimeoutException **   
The operation timed out.    
 ** Message **   
A message describing the problem.
HTTP Status Code: 400

 ** ResourceNumberLimitExceededException **   
A resource numerical limit was exceeded.    
 ** Message **   
A message describing the problem.
HTTP Status Code: 400

## Examples
<a name="API_CreateLFTagExpression_Examples"></a>

### Example
<a name="API_CreateLFTagExpression_Example_1"></a>

This example illustrates one usage of CreateLFTagExpression.

```
{
  "CatalogId": "123456789012",
  "Name": "city_department",
  "Description": "A tag expression for city: NYC or Paris and department: Sales",
  "Expression": [
    {
      "TagKey": "City",
      "TagValues": [
        "NYC",
        "Paris"
      ]
    },
    {
      "TagKey": "Department",
      "TagValues": [
        "Sales"
      ]
    }
  ]
}
```

## See Also
<a name="API_CreateLFTagExpression_SeeAlso"></a>

For more information about using this API in one of the language-specific Amazon SDKs, see the following:
+  [Amazon Command Line Interface V2](https://docs.amazonaws.cn/goto/cli2/lakeformation-2017-03-31/CreateLFTagExpression) 
+  [Amazon SDK for .NET V4](https://docs.amazonaws.cn/goto/DotNetSDKV4/lakeformation-2017-03-31/CreateLFTagExpression) 
+  [Amazon SDK for C\+\+](https://docs.amazonaws.cn/goto/SdkForCpp/lakeformation-2017-03-31/CreateLFTagExpression) 
+  [Amazon SDK for Go v2](https://docs.amazonaws.cn/goto/SdkForGoV2/lakeformation-2017-03-31/CreateLFTagExpression) 
+  [Amazon SDK for Java V2](https://docs.amazonaws.cn/goto/SdkForJavaV2/lakeformation-2017-03-31/CreateLFTagExpression) 
+  [Amazon SDK for JavaScript V3](https://docs.amazonaws.cn/goto/SdkForJavaScriptV3/lakeformation-2017-03-31/CreateLFTagExpression) 
+  [Amazon SDK for Kotlin](https://docs.amazonaws.cn/goto/SdkForKotlin/lakeformation-2017-03-31/CreateLFTagExpression) 
+  [Amazon SDK for PHP V3](https://docs.amazonaws.cn/goto/SdkForPHPV3/lakeformation-2017-03-31/CreateLFTagExpression) 
+  [Amazon SDK for Python](https://docs.amazonaws.cn/goto/boto3/lakeformation-2017-03-31/CreateLFTagExpression) 
+  [Amazon SDK for Ruby V3](https://docs.amazonaws.cn/goto/SdkForRubyV3/lakeformation-2017-03-31/CreateLFTagExpression)