Document migration
Conversion Should Never Invent History
A converter may extract source facts and infer structure, but must label inference and leave unavailable history unknown.
The safe operating rule
Preserve the source. Label extraction and inference. Keep unknowns unknown. Record warnings and failures. Reconcile every batch.
What UD does not claim
No perfect conversion, 100% OCR accuracy, compliance preservation, legal equivalence, accepted archival-standard status or freedom from manual review is promised.