ConceptXML Forms Architecture
XFA
A dynamic form specification designed by Adobe for PDF forms, in which field definitions, data bindings, and rendering logic are stored as XML. It does not generate a PDF page text layer, which prevents parsers from extracting text.
Timeline (last 90 days)
Oct 13
The IRS W-9 form PDF is in XFA format, with the text existing in the script layer rather than the page layer, and after conversion the 6-page document returned only 85 characters.
Unverified50%
Aug 26
XFA（XML Forms Architecture）是 Adobe 引入的基于 XML 的表单系统，已在 PDF 2.0 规范中被正式废弃
Unverified50%