Objects that are referenced within a PDF. For example, if a PDF contains many occurrences of the same object, it exists as a single resource that is referenced many times.
Includes information embedded in the PDF that can be used by an XMP-enabled application or device in the workflow. This information can include meaningful descriptions and titles, searchable keywords, the author’s name, and copyright information. If you select Include Advanced Fields, you can include the fields and structures used for storing the metadata using namespaces and properties. This advanced information appears as a text-based tree view of all the XMP data in the PDF, both for the document as well as for those images in the PDF for which XMP metadata is present.