property XFA;
Returns the XFA XML packet embedded in the document (PDF/A 2.0 deprecated the format, but Acrobat-generated forms still use it).
Empty when the document is not an XFA document.
Wraps the corresponding PDFium API and exposes it as a TPdf instance member so consumers do not have to manage FPDF_DOCUMENT handles directly.
Pdf1.Active before calling page-scoped operations; methods that require an open document raise EPdfError otherwise.SaveToFile to persist.
if Pdf1.Active then
Pdf1.XFA;