Write Metadata
You can use the Write Metadata step to add new metadata to any existing metadata in the Lumada Data Catalog that is already associated with specific data resources. You can add a description and tags to the data resource. You can also add metadata for any new data resources that your transformation may be adding to Data Catalog.
The Write Metadata step includes options to identify, locate, and append the metadata associated with existing Resource IDs in the Data Catalog.
For more information about accessing Lumada Data Catalog in PDI, see PDI and Data Catalog.
Before you begin
Before you can use the Write Metadata step, you must establish a VFS connection to Data Catalog. For more information see Access to Data Catalog. You must also have role permissions set in Data Catalog to create and write tag descriptions for data resources that are registered in Data Catalog.
General
The following options are general to the Write Metadata transformation step.
| Option | Description |
| Step Name | Specify a unique name for the Write Metadata step. You can customize the name or use the default name. |
| Connection |
Select the name of your connection to Data Catalog. See Connecting to Virtual File Systems for details. |
Options
You can use the Write Metadata step to select the ID for an existing data resource in Data Catalog. The Write Metadata step appends new tags and descriptions of the selected tags to any existing tags for the resource.
Input tab
You can use the Input tab to specify how a transformation obtains resource IDs from Data Catalog to use as input.
If your transformation needs only a specific data resource, you can enter the ID for that data resource in the Resource ID field. The Write Metadata step adds new tags to only that specific data resource.
If the transformation is designed to work with multiple resource IDs, the resource IDs can be supplied as input from a previous step in the transformation,such as the Read Metadata step. You can select one of the resource ID options to specify how the resource IDs are supplied to the next step in a transformation.
| Resource ID option | Description |
| Accept resource ids from previous step | Select this option if the exact resource IDs are the incoming data from a previous step in the transformation. |
| Pass through fields from previous step | Select this option if the resource IDs are in a specific field that is incoming from a previous step in the transformation. |
| Field in the input to use as resource id | If you selected the Pass through fields from previous step option, enter the name of the field that contains the resource IDs. |
Metadata tab
In the Metadata tab, you can specify metadata business terms that you want to associate with the data resources that are identified in the Input tab. The PDI option to add metadata tags matches the Data Catalog Add a tag feature.
For example, if your transformation uses the Catalog Input step to create a data resource in Data Catalog, you can use the Write Metadata step to inject resource IDs into your transformation and add business terms to those data resources.
In the Business Terms list, you can select one or more business terms that are available through your Data Catalog connection, and then enter or edit a description in the Description box.
| Option | Description |
| Description | Enter or edit the description for the business that you selected from the Business Terms list. |
| Business Terms | Select business terms that you want associated with the resource ID, and then click ADD. |