Develop > Controller layer > Application developer > Catalog subsystem
Catalog and marketing attachments - developer overview
For the catalog and marketing assets, an attachment consists of the following components:
- Attachment relationship
- An attachment relationship is a link between a catalog or marketing asset and its supplementary material.
- Attachment target
- An attachment target is a container for the supplementary material. An attachment target can contain one or more files or URLs. No two files in an attachment target may apply to the same language.
- Attachment asset
- An attachment asset is an individual file or URL in an attachment target.
The following diagram shows the structure of relationships between catalog and marketing assets, attachment relationships, attachment targets, and attachment assets:
Although this diagram shows multiple attachment assets in an attachment target, you can have just one attachment asset in an attachment target. To display an attachment asset in all languages on a store page, each attachment asset must be in a separate attachment target.
A JSP application developer can reference attachments when designing a store using the Attachment code snippet and the attachment data bean. WebSphere Commerce ensures that the correct attachment asset displays, depending on the language of the user when browsing the store.
For example, if the store sells televisions, you might want to provide access to the user manuals for the televisions, from the product page. The following diagram shows the relationship between the catalog entry for a television and the user manuals for the television in various languages:
For this example, the store page for the television catalog entry would display one link to the television user manual. When users click the link, they would see the television user manual in the same language in which they are viewing the store.
The first time you add an attachment asset to a catalog or marketing asset, an attachment target is automatically created. Also, the first attachment asset is assigned to all languages. Adding attachment assets for different languages to the same attachment target requires you to adjust the language assigned to the original attachment asset in the attachment target.
Managed files are initially written to the WebSphere Commerce database. When certain criteria are met, managed files are copied from the WebSphere Commerce database to the WebSphere Commerce EAR file. In a federated environment, all copies of the WebSphere Commerce EAR file are updated automatically.
You cannot view the attachment file in a store page until the attachment asset is available in the WebSphere Commerce EAR file. As long as the attachment asset is available only in the WebSphere Commerce database, you can view the file only in a store page using the preview function.
Catalog and marketing attachment assets are not managed using the Manage Files menu item in WebSphere Commerce Accelerator.
Related concepts
Catalog and marketing attachments
Related tasks
Add or removing a catalog attachment
Related reference
JSP code snippet: Catalog attachments display