A few kilobytes of internal entities expanded to millions of nodes (each top-level
reference stays under roxmltree's per-reference cap), so a 1 MB file exhausted memory.
SVG keeps DTDs, which Illustrator's exports use for entities, but caps the expanded
document at 4 million nodes. Final Cut Pro XML and FCPXML, which FilmCraft parses
without a node limit, are refused when they declare an entity; real exports never do.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
