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    RecAPI 
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| _R_IOStreamfuncs | Container structure of the IOStream callback functions | 
| _RPPERRORS | Error list item | 
| BAR_INFO | Barcode information | 
| CELL_INFO | Structure of a cell in a table | 
| CLASSIFY_INFO | Structure for information about classification | 
| COMB_CELL_INFO | Structure of a comb-cell in a comb | 
| COMPRESSED_IMG_INFO | Basic physical information of a compressed image buffer | 
| CUT_INFO | Structure for book images | 
| FoundText | Search result | 
| HNR_BOXDATA | Character box of HNR | 
| IMG_INFO | Structure of an image containing basic physical information | 
| KRECMODULEINFO | Module info | 
| LANGUAGE_INFO | Language info | 
| LETTER | The LETTER structure | 
| LSPC | Additional information about the space character | 
| OUTPUTCONVERTERINFOA | Output document converter information (ANSI) | 
| OUTPUTCONVERTERINFOW | Output document converter information (Unicode) | 
| PREPROC_INFO | Information about preprocessing | 
| PROGRESSMONITOR | Progress information | 
| RLINE | Structure of a line | 
| SEnumTypeElement | Descriptor structure of an enum type element | 
| STATISTIC | Recognition statistics | 
| ZONE | ZONE structure | 
| ZONEDATA | ZONEDATA structure |