Graphics Programs Reference
In-Depth Information
when viewed. The creator (the program which created the content) and producer (the
program that wrote the PDF file) are also recorded. Each document also has a set of
unique identifiers, allowing them to be tracked through a workflow.
Since PDF 1.4, the metadata can be stored in an XML (eXtensible Markup Langauge)
document embedded in the PDF using Adobe's Extensible Metadata Platform (XMP).
This defines a way to store metadata for objects in the PDF which can be extended by
third parties to hold information relevant to their particular workflows or products.
Navigation
PDF documents have two methods of navigation, when viewed on screen:
• The document outline , commonly known as the document's bookmarks , is a struc-
tured list of destinations within the document, shown alongside it. Clicking on one
moves the view to that page or position.
• Hyperlinks within the text or graphics of a document allow the user to click to
move elsewhere within the document, or to open an external URL.
Optional Content
Optional content groups in PDF allow parts of the content of a page to be grouped
together and shown—or not shown—based on some other factor (user choice, whether
the document is on screen or printed, the zoom factor). Relationships between groups
can be defined, so that they depend upon one another. One use for this is to emulate
the “layers” found in graphics packages. For example, Adobe Illustrator layers are pre-
served when a document it produces is read with a PDF viewer.
Multimedia
PDF documents can include various kinds of multimedia elements. A lot of this breaks
the portability inherent in PDF, and is often not well supported outside of Adobe
products.
From PDF 1.2
Sounds and movies can be embedded.
From PDF 1.4
Slide shows can be defined, to move automatically between pages with transition
effects.
From PDF 1.5
A more general system for including arbitrary media types was introduced.
From PDF 1.6
3D Artwork can be embedded.
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