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QUESTION: What's the difference between FDF and XFDF?
ANSWER:
FDF and XFDF are both file formats for representing the form data and annotations
that are contained in a
PDF form.
There are two main differences between FDF format and XFDF format:
- The syntax that is used for representing information in FDF format is
different than the syntax used for representing that same information in XFDF format.
- There are some kinds of information that can be represented in FDF format
but cannot be represented in XFDF format. Specifically: the following information
in a PDF form can be represented in FDF format but not in
XFDF format: Status, Encoding, JavaScript, EmbeddedFDFs, Differences, Target, and Pages.*
This is what FDF looks like
FDF stands for "Forms Data Format." In the FDF format, information is represented in the form of key/value pairs.
Here is an example of some FDF code that represents a form field named Street
with a value of 345 Park Avenue.
/T(Street)/V(345 Park Avenue)
In this example, there are two keys and two values: a key named T
with a value of Street, and a key named V with a value of 345 Park Avenue.
This is what XFDF looks like
XFDF stands for "XML Forms Data Format" — so, as you would expect,
XML syntax is used.
Here is XFDF code that represents the information above.
<field name="Street">
<value>345 Park Avenue</value>
</field>
More information. . .
For more information about the FDF format, click here.
For more information about the XFDF format, click here.
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