What This Category's Data Looks Like
Data sources for urban gas policy and regulatory basis include national industry standards issued by the Ministry of Housing and Urban-Rural Development and the National Development and Reform Commission, local implementation rules released by provincial and municipal gas regulatory authorities, and internal operation management systems of urban gas enterprises under urban investment companies. National policies are updated every 1 to 2 years. Local rules are updated irregularly based on local regulatory requirements. Most documents are in PDF format. Their structure includes fields such as document number, clause number, applicable scenario, operation process, and penalty standards. Units involve professional expressions like gas consumption, charging standards, and safety inspection cycles.
Constraints for Document Parsing and Chunking
Mixed national and local policy documents create complex hierarchical structures. When chunking, retain the contextual association of document numbers and clause numbers. Avoid splitting that breaks the integrity of policy logic. Large policy compilation PDFs may contain dozens of local rules. Parsing these requires longer processing time, otherwise timeout interruptions may occur. Documents from different sources have inconsistent layouts. Some local rules have non-standard formats, so flexible parsing rules are needed. Regularly updated policy documents require re-triggering the parsing process. This ensures Q&A results align with the latest policies.
Configuration Settings
| Configuration Item | Recommended Value | Rationale |
|---|---|---|
chunkSize | 800–1200 characters | Matches the average length of single clauses in urban gas policy documents, avoids splitting that breaks clause integrity |
chunkSplitter | Split by headings and paragraphs | Aligns with the hierarchical structure of document numbers and clauses in policy documents, retains contextual association |
customPdfParse | Enable local pdf-marker parsing | Avoids timeout or rate limiting issues caused by relying on third-party interfaces, adapts to large policy compilations |
PARSE_FILE_TIMEOUT_SECONDS | 600–900 seconds | Covers the parsing time of hundreds-page policy compilation PDFs, prevents task interruptions mid-process |
UPLOAD_FILE_MAX_SIZE | 1000 MB | Supports the upload requirement for collections of multiple local rules |
chunkSettingMode | Manual configuration | Allows adjustment of chunking rules for policy documents from different sources, adapts to professional field formats |
Three Common Misconfigurations
- Issue: A timeout error is returned after long wait times when using pdf-marker to parse urban gas policy PDFs. Cause: The
PARSE_FILE_TIMEOUT_SECONDSparameter was not adjusted. The default duration is insufficient to complete parsing for hundreds-page documents. - Issue: After deploying pdf-marker locally, FastGPT throws a Cannot read properties of undefined error. Cause: The local service address for
customPdfParsewas not configured correctly, or the service version does not match FastGPT v4.17.0. - Issue: Chunked policy content contains duplicate segments, or the number of recalled results does not meet expectations. Cause: Matching rules for
chunkSizeandchunkSplitterwere not clearly set, leading to chaotic chunk boundaries. The recall logic does not adapt to the professional field structure of policy documents.
How to Verify Proper Configuration
- Upload a locally stored urban gas policy PDF. Check the parsing task's time logs to confirm the duration aligns with the preset timeout setting.
- Navigate to the chunk configuration page. Verify that the
chunkSplitterrules match the heading hierarchy of the uploaded document. - Submit a test Q&A for a policy clause. Check that the returned chunked content retains complete document numbers and clause information.
- Review the file upload limit settings. Confirm that the
UPLOAD_FILE_MAX_SIZEvalue covers the typical size of common policy compilation documents.
The values provided are common starting points and should be measured against the reader's own samples.
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.