PDF, Version 1.7, ExtensionLevel 3 (original) (raw)

Description

PDF (Portable Document Format), developed by Adobe Systems Incorporated, is described by Adobe as a general document representation language. PDF represents formatted, page-oriented documents. These documents may be structured or simple. They may contain text, images, graphics, and other multimedia content, such as video and audio. There is support for annotations, metadata, hypertext links, and bookmarks.

The original version 1.7 of the PDF format was released November 2006 and associated with Acrobat and Adobe Reader 8.0. Version 1.7 was published as ISO 32000-1 in July 2008.

ExtensionLevel 3 was published by Adobe in June 2008, in conjunction with the release of Acrobat 9.0. Adobe stated that this ExtensionLevel will be incorporated into ExtensionLevel 5 and any future ExtensionLevels before a new BaseVersion is established through the ISO standardization process. It introduced support for substantial new functionality within PDF documents, including features in demand from the domains of architecture, engineering, and the geospatial community. These new features include: enforced viewer preferences, for example, to prevent inappropriate scaling of printouts; support for PRC (Product Representation Compact) and a new edition of ECMA-363 (Universal 3D File Format, see U3D_family) for 3D annotations; support for embedding within PDF documents markup that supports information interchange of geospatial and 3D data associated with the document content. Also included in ExtensionLevel 3 are: support for rich media annotations (in particular, Flash video and some H.264 variants); support for a mechanism to save XML form data in PDF/A-2 conforming documents; support for specifying navigation display for a "portable" collection of documents using an SWF file; and enhancements to encryption and digital signature support.