DifferencesEntry

Inheritance and contracts

Parent : PDF\Specification\SchemaEntry

Definition in the specification

Table 243 · Entries in the FDF dictionary
ISO 32000-1:2008, §12.7.7.3.1 · PDF page 468 ↗

/Differences stream

(Optional; PDF 1.4) A stream containing all the bytes in all incremental updates made to the underlying PDF document since it was opened (see 7.5.6, “Incremental Updates”). If a submit-form action submitting the document to a remote server as FDF has its IncludeAppendSaves flag set (see 12.7.5.2, “Submit-Form Action”), the contents of this stream shall be included in the submission. This allows any digital signatures (see 12.8, “Digital Signatures”) to be transmitted to the server. An incremental update shall be automatically performed just before the submission takes place, in order to capture all changes made to the document. The submission shall include the full set of incremental updates back to the time the document was first opened, even if some of them may already have been included in intervening submissions. Although a Fields or Annots entry (or both) may be present along with Differences, there is no requirement that their contents will be consistent with each other. In particular, if Differences contains a digital signature, only the values of the form fields given in the Differences stream shall be considered trustworthy under that signature.

Qualifier: Optional; PDF 1.4

Conditional descriptions remain traceable. A definition alone does not implement a codec, a signature or every format mechanism. Read the coverage.

Construction

Inherited methods

Properties

Constants

'Differences'

'243'

false