You can extend the metadata stored in the repository by associating information with individual repository objects. For example, you may want to store contact information with the sources you create. If you create an Aggregator transformation, you may want to store an email address with that transformation. You associate information with repository objects using metadata extensions.
Repository objects can contain both vendor-defined and user-defined metadata extensions. You can view and change the values of vendor-defined metadata extensions, but you cannot create, delete, or redefine them. You can create, edit, delete, and view user-defined metadata extensions and change their values.
You can create metadata extensions for the following objects in the Designer:
You can create either reusable or non-reusable metadata extensions. You associate reusable metadata extensions with all repository objects of a certain type, such as all source definitions or all Expression transformations. You associate non-reusable metadata extensions with a single repository object, such as one target definition or one mapping.
Creating Metadata Extensions
You can create user-defined, reusable, and non-reusable metadata extensions for repository objects using the Designer. To create a metadata extension, you edit the object for which you want to create the metadata extension, and then add the metadata extension to the Metadata Extension tab.
If you have multiple reusable metadata extensions to create, it is easier to create them using the Repository Manager.
To create a metadata extension:
This tab lists the existing user-defined and vendor-defined metadata extensions. User-defined metadata extensions appear in the User Defined Metadata Domain. If they exist, vendor-defined metadata extensions appear in their own domains.
Editing Metadata Extensions
You can edit user-defined, reusable, and non-reusable metadata extensions for repository objects using the Designer. To edit a metadata extension, you edit the repository object, and then make changes to the Metadata Extension tab.
What you can edit depends on whether the metadata extension is reusable or non- reusable. You can promote a non-reusable metadata extension to reusable, but you cannot change a reusable metadata extension to nonreusable.
Editing Reusable Metadata Extensions
If the metadata extension you want to edit is reusable and editable, you can change the value of the metadata extension, but not any of its properties. However, if the vendor or user who created the metadata extension did not make it editable, you cannot edit the metadata extension or its value.
To edit the value of a reusable metadata extension, click the Metadata Extensions tab and modify the Value field. To restore the default value for a metadata extension, click Revert in the UnOverride column.
Editing Non-Reusable Metadata Extensions
If the metadata extension you want to edit is non-reusable, you can change the value of the metadata extension and its properties. You can also promote the metadata extension to a reusable metadata extension.
To edit a non-reusable metadata extension, click the Metadata Extensions tab. You can update the Datatype, Value, Precision, and Description fields.
To make the metadata extension reusable, select Reusable. If you make a metadata extension reusable, you cannot change it back to non-reusable. The Designer makes the extension reusable as soon as you confirm the action. To restore the default value for a metadata extension, click Revert in the UnOverride column.
Deleting Metadata Extensions
You delete reusable metadata extensions in the Repository Manager.
You can delete non-reusable metadata extensions in the Designer. To delete metadata extensions, edit the repository object, and then delete the metadata extension from the Metadata Extension tab.
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