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XFA came in two kinds and this package treated them as one.
Measured over 2 240 real government forms: 1 499 carry a form, 560 carry an XFA package, and 546 of those are static — a second, proprietary description of a form that is already there, on which everything here already works.
The other fourteen are dynamic: their pages hold a panel reading "Please wait… your PDF viewer may not be able to display this type of document", and the form is laid out from the XML by Adobe's reader and nothing else, the format having been removed from PDF 2.0. A caller meeting one has a document that looks blank and is not.
Form.Dynamic says which kind. Form.Packets hands back the parts of the package, so the values a form was filled with can be read — they live in the datasets part, as ordinary XML.
What measuring found. The library first answered "none dynamic" where the corpus said fourteen: Read refuses a form with no fields, and a dynamic XFA form usually has no AcroForm fields. The documents most needing to be reported were exactly the ones being refused. An empty field list with no XFA is still no form — 561 of 118 833 figure-corpus files carry one a producer left behind — but an empty one with a package is a form whose fields live elsewhere.
The library's count now matches the corpus exactly: 560 packages, 14 dynamic.
100% statement coverage, go vet and -race clean, nine cross-compile targets, CGO-free.