Understanding PDF packages

Prior to PDF version 1.7, all PDF documents were single PDF documents consisting of pages and possibly document-level file attachments. A PDF document as a container for a collection of documents, known as a PDF package, is new in PDF version 1.7, and consists of a cover sheet, package files, and a package specification. It is strongly recommended that you see the Document Description XML Reference for an introduction to the new PDF package feature, the terminology, and details of the DDX elements used to specify PDF packages.

A package specification contains metadata containing basic information about file attachments, as well as any additional custom metadata that may be specified within the Schema. If a package specification is added to a single PDF, it becomes a PDF package, and any pre-existing document-level file attachments automatically become package files. With packages, you can:

•	Create a collection of documents that may not normally be assembled in a single document. For example, some forms cannot be assembled in a single PDF but can be collected together in a package.

•	Flatten a package into a single PDF if the documents it contains are modifiable. For example, an encrypted PDF document would remain as a document-level attachment.

•	Add or change metadata in packages.

•	Add documents to packages.

•	Modify documents in a package. For example, you can change the headers in the documents if they are modifiable.

•	Export documents from a package and subsequently reimport them into the package in a workflow. For example, you could export the documents, digitally sign them, and reimport them into the package.

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