# ID namespace source
<a name="create-id-namespace-source"></a>

The *ID namespace source* is the source of the data in an [ID mapping workflow](create-id-mapping-workflow.md).

Before you create an ID namespace source you must first create a schema mapping or a matching workflow, depending on your use case. For more information, see [Creating a schema mapping](create-schema-mapping.md) and [Match input data using a matching workflow](create-matching-workflow.md).

After you create an ID namespace source, you can use it along with an ID namespace target in an ID mapping workflow. For more information, see [Map input data using an ID mapping workflow](create-id-mapping-workflow.md).

There are two ways to create an ID namespace source in the AWS Entity Resolution console: the [rule-based method](create-id-namespace-source-rule-based.md) or the [provider services method](create-id-namespace-source-provider-services.md).

**Topics**
+ [Creating an ID namespace source (rule-based)](create-id-namespace-source-rule-based.md)
+ [Creating an ID namespace source (provider services)](create-id-namespace-source-provider-services.md)

# Creating an ID namespace source (rule-based)
<a name="create-id-namespace-source-rule-based"></a>

This topic describes the process of creating an ID namespace source using the **rule-based** method. This method uses matching rules to translate first-party data from a source to a target in an ID mapping workflow.

**Note**  
If the input data is the source, then it must have a schema mapping and an associated AWS Glue database.

**To create an ID namespace source (rule-based)**

1. Sign in to the AWS Management Console and open the AWS Entity Resolution console at [https://console.aws.amazon.com/entityresolution/](https://console.aws.amazon.com/entityresolution/).

1. In the left navigation pane, under **Data preparation**, choose **ID namespaces**.

1. On the **ID namespaces** page, in the upper right corner, choose **Create ID namespace**.

1. For **Details**, do the following:

   1. For **ID namespace name**, enter a unique name.

   1. (Optional) For **Description**, enter an optional description.

   1. For **ID namespace type**, choose **Source**.

1. For the **ID namespace method**, choose **Rule-based**.

1. For **Data input**, choose the **Input type** that you want to use and then take the recommended actions.    
[\[See the AWS documentation website for more details\]](http://docs.aws.amazon.com/entityresolution/latest/userguide/create-id-namespace-source-rule-based.html)

1. For **Rule parameters**, do the following.

   1. Specify the **Rule controls** by choosing one of the following options based on your goal.    
[\[See the AWS documentation website for more details\]](http://docs.aws.amazon.com/entityresolution/latest/userguide/create-id-namespace-source-rule-based.html)

      **Rule controls** must be compatible between the source and the target to be used in an ID mapping workflow. For example, if a source ID namespace limits rules to the target but the target ID namespace limits rules to the source, this results in an error.

   1. Specify the **Matching rules** by choosing one of the following options based on your data input type.    
[\[See the AWS documentation website for more details\]](http://docs.aws.amazon.com/entityresolution/latest/userguide/create-id-namespace-source-rule-based.html)

1. For **Comparison and matching parameters**, do the following.

   1. Specify the **Comparison type** by choosing one of the following options based on your goal.    
[\[See the AWS documentation website for more details\]](http://docs.aws.amazon.com/entityresolution/latest/userguide/create-id-namespace-source-rule-based.html)

   1. Specify the **Record matching type** by choosing one of the following options based on your goal.    
[\[See the AWS documentation website for more details\]](http://docs.aws.amazon.com/entityresolution/latest/userguide/create-id-namespace-source-rule-based.html)
**Note**  
You must specify compatible limitations for the source and target ID namespaces. For example, if a source ID namespace limits rules to the target but the target ID namespace limits rules to the source, this results in an error.

1. Specify the **Service access permissions** by choosing an **Existing service role name** from the dropdown list.

1. (Optional) To enable **Tags** for the resource, choose **Add new tag**, and then enter the **Key** and **Value** pair.

1. Choose **Create ID namespace**.

 The ID namespace source is created. You are now ready to [create an ID namespace target](create-id-namespace-target.md).

# Creating an ID namespace source (provider services)
<a name="create-id-namespace-source-provider-services"></a>

This topic describes the process of creating an ID namespace source using the **Provider services** method. This method uses a provider service called LiveRamp. LiveRamp translates third-party encoded data from a source to a target during an ID mapping workflow. 

**Note**  
If the input data is the source, then it must have a schema mapping and an associated AWS Glue database.

**To create an ID namespace source (provider services)**

1. Sign in to the AWS Management Console and open the AWS Entity Resolution console at [https://console.aws.amazon.com/entityresolution/](https://console.aws.amazon.com/entityresolution/).

1. In the left navigation pane, under **Data preparation**, choose **ID namespaces**.

1. On the **ID namespaces** page, in the upper right corner, choose **Create ID namespace**.

1. For **Details**, do the following:

   1. For **ID namespace name**, enter a unique name.

   1. (Optional) For **Description**, enter an optional description.

   1. For **ID namespace type**, choose **Source**.

1. For the **ID namespace method**, choose **Provider services**.
**Note**  
AWS Entity Resolution currently offers the LiveRamp provider service as an ID namespace method. If you have a subscription to LiveRamp, then the status appears as **Subscribed**. For more information about how to subscribe to LiveRamp, see [Step 1: Subscribe to a provider service on AWS Data Exchange](prepare-third-party-input-data.md#subscribe-provider-service).

1. For **Data input**, choose the **AWS Region**, **AWS Glue database**, the **AWS Glue table**, and the **Schema mapping** from the dropdown list.

   You can add up to 20 data inputs.

1. To specify the **Service access** permissions, choose an option and take the recommended action.    
[\[See the AWS documentation website for more details\]](http://docs.aws.amazon.com/entityresolution/latest/userguide/create-id-namespace-source-provider-services.html)

1. (Optional) To enable **Tags** for the resource, choose **Add new tag**, and then enter the **Key** and **Value** pair.

1. Choose **Create ID namespace**.

 The ID namespace source is created. You are now ready to [create an ID namespace target](create-id-namespace-target.md).