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 (in Acrobat 9, a PDF package is referred to as a portfolio).

A package specification contains metadata that contains 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 preexisting document-level file attachments automatically become package files. With packages, you can perform these tasks:

•	Create a collection of documents that may not typically 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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