## ADDED Requirements

### Requirement: PP-StructureV3 Configuration

The system SHALL configure PP-StructureV3 with the following settings:

**Preprocessing (Stage 1):**
- Document orientation classification MUST be enabled (`use_doc_orientation_classify=True`)
- Document unwarping MUST be enabled (`use_doc_unwarping=True`)  
- Textline orientation detection MUST be enabled (`use_textline_orientation=True`)

**Layout Detection (Stage 3):**
- The `chinese` layout model option SHALL use PP-DocLayout_plus-L (83.2% mAP)
- The `default` layout model option SHALL use PubLayNet for English documents
- The `cdla` layout model option SHALL use picodet_lcnet_x1_0_fgd_layout_cdla

**Element Recognition (Stage 4):**
- Table structure recognition SHALL use SLANeXt_wired and SLANeXt_wireless models (69.65% combined accuracy)
- Formula recognition SHALL use PP-FormulaNet_plus-L (92.22% English, 90.64% Chinese BLEU)
- Chart parsing SHALL use PP-Chart2Table
- Seal recognition SHALL use PP-OCRv4_seal

#### Scenario: Processing rotated scanned document
- **WHEN** a PDF document with rotated pages is processed using OCR track
- **THEN** the system SHALL automatically detect and correct the orientation before OCR processing

#### Scenario: Processing complex Chinese document with tables
- **WHEN** a Chinese document containing tables, images, and formulas is processed
- **AND** the user selects "chinese" layout model
- **THEN** the system SHALL use PP-DocLayout_plus-L for layout detection (83.2% mAP)
- **AND** the system SHALL correctly identify table regions

#### Scenario: Table structure recognition with wired tables
- **WHEN** a document contains wired (bordered) tables
- **THEN** the system SHALL use SLANeXt_wired model for structure recognition
- **AND** output correct HTML table structure with proper row/column spanning

#### Scenario: Table structure recognition with wireless tables
- **WHEN** a document contains wireless (borderless) tables
- **THEN** the system SHALL use SLANeXt_wireless model for structure recognition

#### Scenario: Chinese formula recognition
- **WHEN** a document contains mathematical formulas with Chinese characters
- **THEN** the system SHALL use PP-FormulaNet_plus-L for recognition
- **AND** output LaTeX code with correct Chinese character representation

## ADDED Requirements

### Requirement: Model Cache Cleanup

The system SHALL provide documentation for cleaning up unused model caches to optimize storage space.

#### Scenario: User wants to free disk space after model upgrade
- **WHEN** the user has upgraded from older models (PP-DocLayout-S, SLANet) to newer models
- **THEN** the documentation SHALL explain how to delete unused cached models from `~/.paddlex/official_models/`
- **AND** list which model directories can be safely removed
