Adobe acrobat 7.0.5 sdk User Manual
Working with Metadata
Extensible Metadata Platform (XMP)
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Document Information Dictionary
The optional Info entry in the trailer of a PDF file can hold a document information
dictionary containing metadata for the document, including:
dictionary containing metadata for the document, including:
●
title
●
author
●
subject
●
creation and modification dates
●
keywords
●
creator (the original source of the document, such as Microsoft Word)
●
producer (the program that produced the PDF, such as Distiller)
For more information, see the PDF 1.6 Reference.
Metadata Streams
Metadata, both for an entire document and for components within a document, can be
stored in PDF streams called metadata streams. The advantages of metadata streams over
the document information dictionary include the following:
stored in PDF streams called metadata streams. The advantages of metadata streams over
the document information dictionary include the following:
●
PDF-based workflows often embed metadata-bearing artwork as components within
larger documents. Metadata streams provide a standard way of preserving the
metadata of these components for examination downstream. PD-aware applications
should be able to derive a list of all metadata-bearing document components from the
PDF document itself.
larger documents. Metadata streams provide a standard way of preserving the
metadata of these components for examination downstream. PD-aware applications
should be able to derive a list of all metadata-bearing document components from the
PDF document itself.
●
PDF documents are often made available on the World Wide Web or in other
environments, where many tools routinely examine, catalog, and classify documents.
environments, where many tools routinely examine, catalog, and classify documents.
These tools should be able to understand the self-contained description of the document
even if they do not understand PDF. Besides the usual entries common to all stream
dictionaries, the metadata stream dictionary contains other additional entries. See the PDF
Reference for complete details.
even if they do not understand PDF. Besides the usual entries common to all stream
dictionaries, the metadata stream dictionary contains other additional entries. See the PDF
Reference for complete details.
The contents of a metadata stream is the metadata represented in Extensible Markup
Language (XML). This information will be visible as plain text to tools that are not PDF-
aware only if the metadata stream is both unfiltered and unencrypted.
Language (XML). This information will be visible as plain text to tools that are not PDF-
aware only if the metadata stream is both unfiltered and unencrypted.
Extensible Metadata Platform (XMP)
Adobe’s Extensible Metadata Platform (XMP) is a labeling technology that allows you to
embed metadata into the file itself. With XMP, desktop applications and back-end
publishing systems gain a common method for capturing, sharing, and leveraging this
valuable metadata — opening the door for more efficient job processing, workflow
automation, and rights management, among many other possibilities.
embed metadata into the file itself. With XMP, desktop applications and back-end
publishing systems gain a common method for capturing, sharing, and leveraging this
valuable metadata — opening the door for more efficient job processing, workflow
automation, and rights management, among many other possibilities.