What this category of data looks like
Policy and regulatory basis documents for hazardous chemicals storage and transportation mainly come from official announcements of the Ministry of Emergency Management, local hazardous chemicals supervision departments, industry compliance manuals, and mandatory standards. Update frequency varies with new regulatory requirements and storage and transportation specification adjustments, with no fixed cycle. Most documents have a chapter-based structure, including fields such as document number, effective date, hazardous chemical name, UN number, packaging category, storage and transportation temperature, storage volume limit, etc. Units include cubic meters, kilograms, degrees Celsius, etc. The length of individual documents varies widely; some compliance manual documents can reach dozens of pages.
What constraints do these characteristics impose on the document parsing and chunking link
Documents have a wide range of lengths, and some include structured tables. Default chunking rules may split related key clauses, leading to broken context during Q&A. Documents include dedicated fields such as UN number and packaging category. Default parsing modules cannot fully retain structured information, which will affect the accuracy of subsequent Q&A. Updates have no fixed cycle, so parsing modules need to adapt to different formats of policy documents. If chunking rules are fixed, parsing failures may occur for new policy documents.
How to set the configurations
| Configuration Item | Recommended Approach | Rationale |
|---|---|---|
chunkSize | 800–1200 characters | The core content of single paragraphs in hazardous chemicals storage and transportation policies has moderate length. This range avoids splitting related storage and transportation requirements into different chunks |
chunkSplitter | Split by heading hierarchy | Policy documents have clear chapter and clause hierarchies. Chunking by headings preserves the logical relevance of context |
PARSE_FILE_TIMEOUT_SECONDS | 120–180 seconds | Individual compliance documents have relatively long lengths. This timeout range covers the complete parsing process and avoids mid-process timeout interruptions |
customPdfParse | Enabled | Most hazardous chemicals policy documents include tables, document numbers, and dedicated fields. Custom parsing can fully retain structured information |
chunkSettingMode | Manual configuration | Adjustments to chunking rules are required for dedicated fields such as UN number and packaging category. Manual configuration allows flexible adaptation to document characteristics |
Three common errors
- Phenomenon: Split-related errors appear in parsing logs, or returned chunked content is empty. Cause:
customPdfParseis not enabled. The default parsing module cannot recognize the structured format in hazardous chemicals policy documents, causing the chunking process to interrupt. - Phenomenon: A timeout status code appears after calling the parsing interface, or parsing takes longer than expected. Cause: The
PARSE_FILE_TIMEOUT_SECONDSparameter is not adjusted, and the default short timeout setting is used, which cannot adapt to long-length hazardous chemicals compliance documents. - Phenomenon: Key fields such as UN number and packaging category are missing from chunked results. Cause:
customPdfParseis not enabled. The default parsing module does not retain structured identifiers in documents, leading to incomplete chunked content.
How to confirm the configuration is correct
- Upload a single hazardous chemicals policy PDF document, view the parsed chunk list, and confirm that each chunk contains complete storage and transportation clauses and related fields.
- Check the parsing logs to confirm there are no split-related error messages, and the timeout time matches the preset configuration.
- Compare the original document with the chunked results to confirm that key information such as document number and effective date is not split into different chunks.
- Call the parsing interface of FastGPT v4.17.0 to verify that the returned chunked data includes expected dedicated fields related to hazardous chemicals.
The values listed above are common starting points. Adjust them based on your own specific samples and use cases.
Question material comes from public community discussions. Configuration values are common starting points and should be measured against your own samples. Verified on 2026-09-28.