Document AI is useful when it admits what it cannot verify_

PP-StructureV3 can turn documents into structured JSON or Markdown through preprocessing, OCR, layout analysis, recognition, and postprocessing. Business correctness still sits outside the parser.

An invoice total can be recognized perfectly and still belong to the wrong column. Confidence in characters is not confidence in accounting meaning.

What changes in practice_

Apply schema checks, cross-field rules, duplicate controls, and reviewer queues. Measure field correctness separately from field population.

• Preserve source evidence.
• Validate business relationships between fields.
• Turn recurring reviewer corrections into rules or training data.

Our take_

The durable advantage is not adopting the newest tool first. It is building the identity, state, evidence, and operating boundaries that let a real team own the system after launch.