Document migration
The Original File Should Remain Part of the Story
A derivative UD should reference the original format, exact hash, size, conversion time, tool version, warnings and result.
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.