Document Intelligence Promotion

Single-pass extraction + multi-stage post-processing pipeline.

Note: This pipeline uses pdfplumber for single-document extraction (not batch). For batch text extraction across the corpus, use pdftotext via subprocess — see pdf/pdftotext-poppler sub-skill.

Architecture

PDF/DOCX → parser (single read) → manifest.yaml
                                       ↓
                            deep_extract.py (post-processors):
                            ├── table_exporter.py → CSV files
                            ├── worked_example_parser.py → pytest files
                            └── chart_extractor.py → images + metadata YAML

CLI Commands

# Single document — deep extraction with report
uv run --no-project python scripts/data/doc-intelligence/deep-extract.py \
    --input <file.pdf> --domain naval-architecture --report --verbose

# From existing manifest
uv run --no-project python scripts/data/doc-intelligence/deep-extract.py \
    --manifest <manifest.yaml> --report

# Batch extraction with deep post-processing
uv run --no-project python scripts/data/doc-intelligence/batch-extract.py \
    --queue <queue.yaml> --deep --verbose

# Promote extracted artifacts to code
uv run --no-project python scripts/data/doc-intelligence/promote-to-code.py \
    --types tables worked_examples curves

Post-Processor Details

Tables (table_exporter.py)

• Reads ExtractedTable from manifest → writes CSV with header + rows
• Idempotent (content-hash check)
• Generates JSONL records for promoter integration

Worked Examples (worked_example_parser.py)

• Parses "Example N.N:" title + "Given:" inputs + "Solution:" output
• Extracts: symbol, value, unit for each input parameter
• Generates real pytest files with pytest.approx(expected, rel=1e-3)

Charts (chart_extractor.py)

• Extracts embedded images from PDFs via PyMuPDF
• Filters icons/logos (min 100x80px)
• Links images to figure references by page number
• Generates calibration metadata YAML for manual digitization

Extraction Yield Reality (WRK-1246 Assessment)

Proven yield across 420K+ corpus:

Focus extraction effort on tables. Other content types exist in the manifest schema but produce no usable output from the current pipeline.

Table Quality Gate

Before promoting extracted tables, apply three quality filters:

1. Content-hash dedup: Remove identical repeated tables. IHS watermark tables and repeated header/footer tables appear across many pages — hash each table's content (header + rows) and deduplicate.
2. Min-content threshold: Skip tables with fewer than 3 data rows or fewer than 2 numeric columns. These are typically formatting artifacts, not engineering data.
3. LLM quality rating: Rate each surviving table as usable / partial / junk via Haiku. Usable tables have clear headers, consistent units, and meaningful data. Partial tables may need manual cleanup. Junk tables are formatting noise.

Chart Extraction Note

Chart extraction is metadata-only — the pipeline captures figure references, captions, and page locations but does not extract the image content itself. Image extraction requires PyMuPDF (fitz) and is tracked under WRK-1257.

Table → YAML → Code → Calc Report (WRK-1188 Learning)

Primary workflow for engineering standards (not textbook example parsing):

Extracted tables (CSV)
    ↓ promote to data/standards/promoted/<standard>/
YAML calc report inputs (from table data)
    ↓ validate against existing Python code
Code-validated outputs
    ↓ generate-calc-report.py
HTML calculation report

Steps

1. Deep-extract the PDF: deep-extract.py --input <pdf> --domain <domain> --report
2. Review tables: identify high-value reference data (constants, coefficients, safety factors)
3. Promote tables: copy to data/standards/promoted/<standard>/ with clean names
4. Check existing code: does digitalmodel/ or assetutilities/ already implement this?
5. Create calc report YAML: map extracted table values to inputs, compute outputs
6. Validate: run Python code with same inputs, compare outputs
7. Generate HTML: generate-calc-report.py <calc-report>.yaml

Proven Examples

Why Not Worked Examples?

Engineering standards don't use textbook "Example N.N: Given: Solution:" format. Calculation procedures are inline in numbered sections. The table→YAML→code pipeline extracts the reference data and validates against implemented code — more reliable than text parsing.

WRK-1188 finding: 0 worked examples found across 9 major engineering standards (DNV-RP-B401, C203, F109, API RP 2A, 579-1, etc.). Deprioritize worked_example extraction for standards; focus extraction effort on tables.

Key Scripts

Promoted Table Locations

data/standards/promoted/
├── dnv-rp-b401/    # 8 CP design tables
├── dnv-rp-c203/    # 2 S-N curve tables (air + seawater)
└── dnv-rp-f109/    # 3 stability tables