Document Extraction
Document Extraction
Start with meaning, then move to detail.
This lesson explains Document Extraction as part of using Hermes and understanding its behavior. You will learn what it does, when it matters, and the smallest safe test that proves it works.
If you are new, do not memorize names. Focus on three questions: what problem does this solve, what access does it need, and how can you verify the result?
For practice, inspect the first example, identify its effects, run it on test data, and compare the result with the source claim.
For advanced readers, inspect Supported formats, Scanned PDFs: the coverage warning, then verify failure modes and version compatibility.
Start with installation if you have not run Hermes yet.
A clear outcome before you read.
- Understand Document Extraction without assumed prior knowledge.
- Separate the source description from what still needs testing in your environment.
- Read the first command and identify its inputs and outputs before copying it.
How read_file converts PDFs, Office documents, and notebooks to text — and what to do when a PDF is scanned images
What does the source say, and in what order?
- 01Supported formats
Start here to understand the core idea or structure.
- 02Scanned PDFs: the coverage warning
Finish here to verify the result and special cases.
Copy only after you understand the effect.
[EXTRACTION COVERAGE WARNING: 198 of 311 pages in this PDF yielded no
text. ... Unreadable gaps, each labeled with the last text extracted
before it:
pages 42-77 (36 pages) — after "Antigua Maintenance Corp Bylaws" (p41)
pages 92-213 (122 pages) — after "... Covenants, Codes and Regulations" (p91)
page 224 (1 page) — after "... Insurance Declaration Pages" (p223)
Decide which gaps you actually need — do NOT OCR or render everything. ...]pdftoppm -jpeg -r 150 -f 92 -l 94 document.pdf /tmp/pageRead the first command and identify its inputs and outputs before copying it.
Match every command to your installed Hermes version, review the files and accounts it can reach, and use non-sensitive data for the first test. If this explanation differs from the source, the official source wins.