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A PDF/A file cannot contain an XML form templates (XFA
forms).
The DocConverter service flattens XML form templates that appear
in a PDF file, including XML signatures. The service captures information
about the removed signatures in metadata. It also records the appearance
of the removed signatures into the document by adding an equivalent
image to the PDF file. The flattened signatures cannot be verified.
The process of transforming an interactive PDF document to a
non-interactive PDF document is called flattening. When a
PDF document is flattened, form fields retain their graphical appearance
but are no longer interactive. Also, the data in the form cannot
be extracted by using standard tools; however, the data is still present
in the PDF/A.
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