ABB 086351-004 controller module
Technical data of product parameters
The086351-004 added when a file is updated contains entries only for
objects that have been changed, replaced, or deleted. Deleted objects are left
unchanged in the file, but are marked as deleted by means of their cross-reference
entries. The added trailer contains all the entries (perhaps modified) from the
previous trailer, as well as a Prev entry giving the location of the previous crossreference section (see Table 3.13 on page 97). As shown in Figure 3.3, a file that
has been updated several times contains several trailers; each trailer is terminated
by its own end-of-file (%%EOF) marker.
Because updates are appended to PDF files, a file can have several copies of an
object with the same object identifier (object number and generation number).
This can occur, for example, if a text annotation (see Section 8.4, “Annotations”)
is changed several times and the file is saved between changes. Because the text086351-004
annotation object is not deleted, it retains the same object number and generation
number as before. An updated copy of the object is included in the new update
section added to the file. The update’s cross-reference section includes a byte
offset to this new copy of the object, overriding the old byte offset contained in
the original cross-reference section. When a consumer application reads the file,086351-004
it must build its cross-reference information in such a way that the most recent
copy of each object is the one accessed in the file.
In versions of PDF earlier than 1.4, it was not possible to use an incremental
update to alter the version of PDF to which the document conforms, since the
version was specified only in the header at the beginning of the file (see Section086351-004
3.4.1, “File Header”). In PDF 1.4, it is possible for a Version entry in the
document’s catalog dictionary (see Section 3.6.1, “Document Catalog”) to
override the version specified in the h
Product picture display
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