When capturing the metadata information of an asset, users provide information in the various available fields. You can display specific metadata fields or field values that are dependent on the options selected in the other fields. Such conditional display of metadata is called cascading metadata. In other words, you can create a dependency between a particular metadata field/value and one or more fields and/or their values.
Use metadata schemas to define rules for displaying cascading metadata. For example, if your metadata schema includes an asset type field, you can define a pertinent set of fields to be displayed based on the type of asset a user selects.
Here are some use cases for which you can define cascading metadata:
Consider a scenario where you want to display cascading metadata based on the type of asset that is selected. Some examples
Irrespective of the asset type chosen, display the copyright information as a required field.
Select the Experience Manager logo, and go to Tools > Assets > Metadata Schemas.
In the Schema Forms page, select a schema form and then select Edit from the toolbar to edit the schema.
(Optional) In the metadata schema editor, create a field to conditionalize. Specify a name and property path in the Settings tab.
To create a tab, select
+ to add a tab and then add a metadata field.
Add a Dropdown field for asset type. Specify a name and property path in the Settings tab. Add an optional description.
Key-values pairs are the options provided to a form-user. You can provide the key-value pairs either manually or from a JSON file.
To specify the values manually, select Add Manually, and select Add Choice and specify the option text and value. For example, specify Video, PDF, Word, and Image asset types.
To fetch the values from a JSON file dynamically, select Add Through JSON Path and provide the path of the JSON file. Experience Manager fetches the key-value pairs in the real time when the form is presented to the user.
Both options are mutually exclusive. You cannot import the options from a JSON file and edit manually.
When you add a JSON file, the key-value pairs are not displayed in the metadata schema editor but are available in the published form.
When adding choices, if you click the pop-up field, the interface is distorted and the delete icon for the choices stops working. Do not click the drop-down until you save the changes. If you face this issue, save the schema and open it again to continue editing.
(Optional) Add the other required fields. For example, format, codec, and duration for the asset type video.
Similarly, add dependent fields for other asset types. For example, add fields page count and author for document assets, such as PDF and Word files.
To create a dependency between the asset type field and other fields, choose the dependent field and open the Rules tab.
Under Requirement, choose the Required, based on new rule option.
Select Add Rule and choose the Asset Type field to create a dependency. Also choose the field value on which to create the dependency. In this case, choose Video. Select Done to save the changes.
Dropdown with manually predefined values can be used with rules. Dropdown menus with configured JSON path can’t be used with rules that use predefined values to apply conditions. If the values are loaded from JSON at runtime, it is not possible to apply a predefined rule.
Under Visibility, choose the Visible, based on new rule option.
Select Add Rule and choose the Asset Type field to create a dependency. Also choose the field value upon which to create the dependency. In this case, choose Video. Select Done to save the changes.
To reset the values, select anywhere on the interface other than the values. If the values are reset, select the values again.
You can apply Requirement condition and Visibility condition independent of each other.
Similarly, create a dependency between the value Video in the Asset Type field and other fields, such as Codec and Duration.
Repeat the steps to create dependency between document assets (PDF and Word) in the Asset Type field and fields such as Page Count and Author.
Click Save. Apply the metadata schema to a folder.
Navigate to the folder to which you applied the Metadata Schema and open the properties page of an asset. Depending upon your choice in the Asset Type field, pertinent cascading metadata fields are displayed.
Figure: Cascading metadata for Video asset
Figure: Cascading metadata for document asset