What this test checks
This test checks whether the PDF document has a dynamic XFA type form.
Why this maybe a barrier
XFA or "XML Forms Architecture" is a specialized, proprietary XML-based form technology which acts as a dynamic data container, instead of using standard PDF form fields. Many standard PDF viewers and assistive technologies cannot process them, as XFA is not part of the PDF ISO standard, creating an accessibility barrier.
Specifically, dynamic XFA forms can alter their size and page layout and require script-driven reflow. This cannot guarantee accessibility or structural consistency required by PDF/UA.
WCAG 2.2 Success Criterion
N.A (PDF/UA-only check).
PDF/UA Principle
Section 7.15: XFA — "If the AcroForm dictionary (ISO 32000-1:2008, 12.7.2) of the document catalog dictionary contains an XFA key, whose value is either an array or a stream, then the PDF shall be considered as an XFA-based form".
For implementation, it uses the Matterhorn protocol checkpoint namely 25-001:
25-001 — File contains the dynamicRender element with value "required".