A metadata schema describes the properties, layout, and so on for the Properties page of an asset in Adobe Experience Manager (AEM) Assets Brand Portal. The schema that you apply to an asset determines the metadata fields that appear on its Properties page.
Normally, the Properties page for each asset includes default metadata properties depending upon the MIME type of the asset. To include more metadata properties or modify existing properties, edit the Metadata Schema Forms editor, which defines the properties and layout of the Properties page. You can also use a different Metadata Schema form for assets of a particular MIME type to enable their Properties pages to conform to a specific layout.
When you modify a metadata schema for a certain MIME-type of assets, the layout for the current MIME-type and all asset subtypes are modified. For example, modifying a jpeg schema under default/image only modifies the metadata layout (asset properties) for the IMAGE/JPEG MIME-type of assets. However, if you edit the default schema, your changes modify the metadata layout for all types of assets.
Brand Portal provides the following templates out of the box:
The following child forms inherit the properties of the default form:i. image: Schema form for assets with the MIME type "image", for example, image/jpeg,image/png, and so on.The "image" form has the following child form templates:a. jpeg: Schema form for assets with sub type jpeg.b. tiff: Schema form for the assets with sub type tiff.ii. application: Schema form for assets with MIME type "application", for example application/pdf, application/zip, and so on.a. pdf: Schema form for assets with sub type pdf.iii. video: Schema form for assets with MIME type "video", such as video/avi, video/mp4, and so on.
- default: This is the base form for assets. Every asset uses this template.
To use Bulk Metadata Editing, select multiple assets from the Brand Portal user interface.
- bulkview: This form defines the template used for Bulk Metadata editing.
To view the child forms of a schema form, click the schema form name.
You can edit a newly-added or existing metadata schema form. The metadata schema form contains content derived from it's parent, including:
- Form items within tabs.
You can map/configure these form items to a field within a metadata node.
You can add new tabs or form items to the metadata schema form. The derived tabs and form items (from the parent) are in the locked state. You cannot alter them at the child level.
The Build Form tab lists form items that use can use in your schema form. The Settings tab provides the attributes of each item that you select in the Build Form tab. The following table lists the form items available in the Build Form tab:
|Section Header||Add a section heading for a list of common components.|
|Single Line Text||Add a single line text property. It is stored as a string.|
|Multi Value Text||Add a multi value text property. It is stored as a string array.|
|Number||Add a number component.|
|Date||Add a date component.|
|Dropdown||Add a dropdown list.|
|Standard Tags||Add a tag.|
|Hidden Field||Add a hidden field. It is sent as a POST parameter when the asset is saved.|
|Asset Referenced By||Add this component to view list of assets referenced by the asset.|
|Asset Referencing||Add to display a list of assets that reference the asset.|
|Products References||Add to show the list of products linked with the asset.|
To edit the properties of a metadata component on the form, click the component and edit its properties in the Settings tab.
Field Label: The name of the metadata property that is displayed on the asset's Properties page.
Map to Property: The value of this property provides the relative path/name to the asset node where it is saved in the CRX repository. It starts with "./" because indicating that the path is under the asset's node.
The following are the valid values for this property:
- ./jcr:content/metadata/dc:title: Stores the value at the asset's metadata node as the property dc:title.
- ./jcr:created: Displays the jcr property at the asset's node. If you configure these properties on view properties, we recommend that you mark them as Disable Edit, because they are protected. Otherwise, the error "Asset(s) failed to modify" occurs when you save the asset's properties.
Placeholder: Use this property to provide the user any relevant information regarding the metadata property.
Required: Use this property to mark a metadata property as mandatory on the Properties page.
Disable Edit: Use this property to make a metadata property uneditable on the Properties page.
Show Empty Field In Read Only: Mark this property to display a metadata property on the Properties page even if it has no value. By default, when a metadata property has no value, it is not be listed on the Properties page.
Description : Use this property to add a short description for the metadata component.
Delete icon Click this icon to delete a component from the schema form.
Only the Hidden Field component does not have the attributes Map to Property, Placeholder, Required, Disable edit and Show Emplty Field in Read Only properties. It has the attributes Name, Value, Field Label, and Description. The values for the Hidden Field component are sent as a POST parameter whenever the asset is saved. It is not be saved as metadata for the asset.
The schema editor lets you add or delete a tab. The default schema form includes the Basic and Advanced tabs, by default.
Click + to add a new tab on a schema form. By default, the new tab has the name "Unnamed-1." You can modify the name from the Settings tab.
Click X to delete a tab.
Brand Portal lets you delete custom schema forms only. It does not let you delete the default schema forms/templates. However, you can delete any custom changes in these forms.
To delete a form, select a form and click the Delete icon.
After you delete custom changes to a default form, the Lock icon reappears before it on the Metadata Schema interface to indicate that the form reverted to its default state.
In addition to the default forms, you can add custom forms for assets of various MIME types. Create a new form under the appropriate form type. For example, to add a new template for the image/png subtype, created the form under the "image" forms. The title for the schema form is the subtype name. In this case, the title is "png."
You can use an existing template for a different MIME type. For example, use the image/jpeg form for assets of MIME type image/png.
In this case, create a new node at /etc/dam/metadataeditor/mimetypemappings in the CRX repository. Specify a name for the node and define the following properties:
exposedmimetype: Name of the existing form to be mapped
mimetypes: List of MIME types that use the form defined in the exposedmimetype attribute
|Schema Form||MIME type(s)|
|video/avi||video/avi, video/msvideo, video/x-msvideo|
Here is the list of default metadata properties: