| Class | Description | 
|---|---|
| CollapseAreasOperator | This operator collapses the areas having only one (leaf) child. | 
| FindLineOperator | Detects the basic lines in the area tree and joins the appropriate areas so that a line
 is the smallest visual area. | 
| GroupAnalyzer | A general analyzer to find area groups | 
| GroupAnalyzerByFlooding | |
| GroupAnalyzerByStyles | This group analyzer tries to expand the selected box to all directions stopping on 
 whitespace separators. | 
| HomogeneousLeafOperator | This operator joins the homogeneous-style leaf nodes to larger artificial areas. | 
| MultiLineOperator | Detects sequences of aligned lines and joins them to a single area. | 
| Separator | |
| SeparatorSet | A generic set of horizontal and vertical separators for a page. | 
| SeparatorSetHVS | A horizntal/vertical separator detection with shrinking. | 
| SortByLinesOperator | |
| SortByPositionOperator | |
| SuperAreaOperator | Detects the larger visual areas and creates the artificial area nodes. |