SECTION 3.10
183
File Specifications
KEY
TYPE
VALUE
F
string
(Required if the
DOS
,
Mac
, and
Unix
entries are all absent; amended with the
UF
entry
for PDF 1.7)
A
file specification
string of the form described in Section 3.10.1, “File
Specification Strings,” or (if the file system is URL) a uniform resource locator, as de-
scribed in Section 3.10.4, “URL Specifications.”
Note:
It is recommended that the
UF
entry be used in addition to the
F
entry. The
UF
en-
try provides cross-platform and cross-language compatibility and the
F
entry provides
backwards compatibility.
UF
text string
(Optional, but recommended if the
F
entry exists in the dictionary; PDF 1.7)
A Unicode
text string that provides file specification of the form described in Section 3.10.1, “File
Specification Strings.” Note that this is a Unicode text string encoded using
PDFDocEn-
coding
o
r UTF-16BE with a leading byte-order marker (as defined in Section , “Text
String Type”)
. The
F
entry should always be included along with this entry for back-
wards compatibility reasons.
DOS
byte string
(Optional)
A file specification string (see Section 3.10.1, “File Specification Strings”)
representing a DOS file name.
Note:
Beginning with PDF 1.7, use of the
F
entry and optionally the
UF
entry is recom-
mended in place of the
DOS
,
Mac
or
Unix
entries.
Mac
byte string
(Optional)
A file specification string (see Section 3.10.1, “File Specification Strings”)
representing a Mac OS file name.
Note:
Beginning with PDF 1.7, use of the
F
entry and optionally the
UF
entry is recom-
mended in place of the
DOS
,
Mac
or
Unix
entries.
Unix
byte string
(Optional)
A file specification string (see Section 3.10.1, “File Specification Strings”)
representing a UNIX file name.
Note:
Beginning with PDF 1.7, use of the
F
entry and optionally the
UF
entry is recom-
mended in place of the
DOS
,
Mac
or
Unix
entries.
ID
array
(Optional)
An array of two byte strings constituting a file identifier (see Section 10.3,
“File Identifiers”) that is also included in the referenced file. The use of this entry im-
proves an application’s chances of finding the intended file and allows it to warn the
user if the file has changed since the link was made.
(Optional; PDF 1.2)
A flag indicating whether the file referenced by the file specifica-
tion is
volatile
(changes frequently with time). If the value is
true
, applications should
never cache a copy of the file. For example, a movie annotation referencing a URL to
a live video camera could set this flag to
true
to notify the application that it should
reacquire the movie each time it is played. Default value:
false
.
V
boolean
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