What the data for this category looks like
Coal chemical industry financing daily report data is sourced from financing disclosure platforms under the national coal industry association, public announcements of listed coal chemical enterprises, and daily financing briefs from third-party industry information institutions. Reports are released once per workday. Each daily document covers financing projects in the coal chemical sector from the current day and the prior three workdays. Most documents are encrypted PDFs or password-protected Excel files. They follow a fixed structure with fields including project name, financing amount, financing subject, investor type, financing completion date, coal chemical subcategory of the project, fund usage, credit line, and additional relevant fields. Financing amount units are uniformly ten thousand yuan. Date fields are precise to the day.
What constraints these characteristics impose on document parsing and chunking
Multi-format source materials require parsing tools to support both unencrypted text extraction and encrypted document decryption, with additional decryption permission configuration required. Documents with a fixed structure but minor adjustments require chunking rules to preserve contextual connections between fields, and avoid splitting core information of the same financing project. Financing lists presented as tables require complete extraction of cell content, to prevent loss of key unit information such as amount and date. Daily batch-updated documents require the parsing process to support batch processing, and the chunking logic to adapt to minor changes in document structure.
How to configure the settings
| Configuration Item | Recommended Setting | Rationale |
|---|---|---|
PARSE_ENGINE | Select built-in or third-party adapter based on requirements | Coal chemical financing daily reports have encrypted documents and multi-format needs, so parsing engines can be switched to adapt to different scenarios |
PARSE_EXCEL_ENABLE | Enabled | Daily reports include Excel-format financing lists, and cell data within tables must be fully extracted |
PARSE_PDF_IMAGE_EXTRACT | Enabled | Some daily reports include project progress charts, and text within images must be extracted for retrieval |
CHUNK_SIZE | 800–1000 characters | The core information length of coal chemical financing projects aligns with this range, balancing retrieval accuracy and contextual completeness |
CHUNK_OVERLAP | 150–200 characters | Preserve contextual links between financing projects and associated fields, and avoid information breaks caused by chunking |
UPLOAD_FILE_MAX_SIZE | 50 MB | Single coal chemical financing daily reports are typically 10-30 MB, so this setting sets a reasonable upload limit |
The parameter values provided on this page are common recommended starting points for configuration. Actual values are affected by material format, data volume, and business rules. Specific issues require individual analysis. It is recommended to test on your own samples before finalizing settings.
Three common mistakes
- The symptom is that no image content is displayed in the interface after uploading a PDF. The cause is that the
PARSE_PDF_IMAGE_EXTRACTconfiguration item is not enabled, or the parsing tool does not have image OCR functionality enabled. - The symptom is that search results only return text blocks without metadata. The cause is that field information from the original document is not associated, or metadata extraction logic is not configured.
- The symptom is that Excel documents cannot be uploaded. The cause is that the
PARSE_EXCEL_ENABLEconfiguration item is not enabled, or theUPLOAD_FILE_MAX_SIZEsetting is smaller than the size of the currently uploaded file.
How to confirm configurations are correctly set
- Upload a coal chemical financing daily report PDF that includes images. Check if the parsed results include text extracted from images, to confirm the image extraction configuration is active.
- Upload an Excel-format financing daily report. Check if all cell data in the table is fully extracted in the parsed results, to confirm the Excel parsing configuration is enabled.
- Send a retrieval request. Check if the returned results include both text blocks and document-related field information, to confirm the metadata association logic is working correctly.
- Upload a financing daily report file that exceeds the conventional size. Confirm that the upload process is not blocked, to confirm the upload size configuration is reasonable.
Question material comes from public community discussions. Configuration values are common starting points and should be measured against your own samples. Verified on 2026-09-14.