The Catalyst Solution for XMP uses plug-ins to capture standard and custom metadata in host applications. Application developers such as Adobe and Quark provide an API, or application programming interface, for developers to use to create small, executable applications that work within the host application. This means that Catalyst does not use the File Info metadata capture scheme in Adobe applications. The control and flexibility available through a Catalyst plug-in far exceeds what is available through Adobe's built-in metadata capture mechanism. Examples of the value today and in the future of this approach include the ability to define how schema properties are represented and when and how the plug-ins communicate with external sources such as databases. Another advantage is the ability to maintain a consistent user experience in every supported application including those not developed by Adobe.
OK, so you want to stamp your document. Maybe you need to give reviewers some advice about the document's status or sensitivity. This tip from author Ted Padova demonstrates how to add stamps with the Stamp Tool along with related comments.