Adobe Acrobat SDK
Implementation Notes
Adobe® Supplement to the ISO 32000
Implementation Notes to Adobe Extensions to ISO 32000 130
186. MD5 signatures are not implemented in Acrobat; item 2 in a shared object group entry must be 0.
187. Acrobat does not support more than one shared object in a group; item 4 in a shared object group
entry should always be 0.
188. In a document consisting of only one page, items 1 and 2 in the shared object hint table are not
meaningful; Acrobat writes unpredictable values for these items.
Implementation Notes to Adobe Extensions to ISO 32000
This section contains notes on the implementation by Acrobat of the Adobe extensions to the PDF
language beyond that contained in ISO 32000. The implementation notes for Adobe extensions have a
suffix of
E-
.
E-1. Acrobat 9.0 stores data required by the welcome page and header in this way in the
Resources
entry
of the collections dictionary. The document
Navigator Template Format
, listed in the
Bibliography
,
describes the content and display of a header and welcome page of a portable collection.
E-2. Acrobat 9.0 Pro has two standard navigators and several custom navigators. When an Acrobat user
chooses a custom navigator while in authoring mode, Acrobat embeds the navigator in the portable
collection. After being embedded and saved, all editions of Acrobat and Adobe Reader, beginning with
version 9.0, can display a portable collection using the embedded custom navigator.
The custom navigator that Acrobat Pro embeds into the portable collection is a stand-alone file
available on the local hard drive. A navigator file collects into a single file, the resources required by a
navigator of a portable collection. Although PDF 1.7 supports two standard collection views (tile and
details), a navigator provides a custom view using a SWF file. The navigator SWF file interacts with a
host authoring or viewing application through Acrobat ActionScript API. See the
Acrobat ActionScript
API Reference
in the
Bibliography
.
E-3. The navigator file format, a NAV file, is based on UCF. (See
Uniform Container Format
listed in the
Bibliography
.) A navigator file contains an XML manifest, the navigator SWF file, and other resources
required by the navigator, such as images, localized strings, and private data. See the
Acrobat Navigator
File Format
in the
Bibliography
for information about the format for a navigator file. See also
implementation note E-2.
E-4. In Acrobat 9.0, the image referenced by the
Icon
entry may be any size. For best results in Acrobat, the
image should be 42 x 42 pixels.
E-5. Acrobat 8.1 adds support for both XFA versions 2.5 and 2.6.
E-6. Authoring forms with barcodes has been available since version 6.0.5; however, the barcode plug-in
was not available as a product feature until version 7.0. In version 6.0.5 of Acrobat and Adobe Reader,
paper form barcodes could only encode PDF417 symbology. Support for Data Matrix and QR Code
symbology was added in version 7.
