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Adobe Acrobat SDK
Adobe® Supplement to the ISO 32000
Table 3.25b shows the entries in a developer extensions dictionary.
KEY
Type
BaseVersion
ExtensionLevel
The PDF document that contains the following segment may contain the Adobe-specific extensions
relative to PDF version 1.7.
%PDF 1.7
<</Type /Catalog
/Extensions
<</ADBE
>>
>>
The PDF document that contains the following segment may contain ACME extension number 4, which is
relative to PDF version 1.7. It may also contain MyCo extension number 1002, which is relative to PDF
version 500 (a hypothetical PDF version number).
%PDF 1.7
<</Type /Catalog
/Extensions
<</ACME
Table 3.25b Entries in a developer extensions dictionary
SUBTYPE
name
name
integer
<</BaseVersion /1.7
/ExtensionLevel 3
>>
VALUE
(Optional) The type of PDF object that this dictionary describes; if
present, will be
DeveloperExtensions
extensions dictionary.
(Required) A name that designates a version of the PDF
specification and that is syntactically consistent with the
key in the
entry. (See Section 3.6.1.) The name value 1.7
Catalog
designates PDF version 1.7, as defined in PDF Reference, sixth
edition, version 1.7 available from the
Center.
Note:
The version in a PDF file can be specified in two places. The
initial line in the file or in the Catalog. The
value may differ from the version number on the header
line, or as supplied by the
is because it reflects the version of the standard that is
extended and not the version of this particular file.
(Required) An integer that is used in conjunction with the
associated
BaseVersion
defined by the developer. The value of
particular
BaseVersion
extensions.
Note:
Developers can designate lower-order digits to represent
sub-levels. For example, the value 100 could represent 1.0,
or the value 101 could represent 1.1.
Syntax (Chapter 3 in PDF Reference)
3.6.4 Extensions to PDF
for a developer
Adobe PDF Technology
BaseVersion
key in the Catalog. This
Version
. The interpretation of this value is
ExtensionLevel
value shall increase over subsequent
25
Version
for a
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