This inheritance list is sorted roughly, but not completely, alphabetically:

[detail level 1234]

CAOI_ColorSpace_CalibratedGray	Calibrated Gray
CAOI_ColorSpace_CalibratedRGB	Calibrated RGB
▼CAOI_ColorSpace_DeviceCMYK	Device CMYK
CAOI_ColorSpace_IllustratorCMYK	Device CMKY with Illustrator overprint
CAOI_ColorSpace_DeviceGray	Device Gray
CAOI_ColorSpace_DeviceN	DeviceN / Multichannel
CAOI_ColorSpace_DeviceRGB	Device RGB
CAOI_ColorSpace_ICC	ICC Profile
CAOI_ColorSpace_Indexed	Indexed colors
CAOI_ColorSpace_Lab	CIE Lab D50
CAOI_Contour	Container for path(s)
CAOI_Document	PDF Document
CAOI_Font_Descriptor	Font descriptor (encoding & charset)
CAOI_Font_File	Font
▼CAOI_Function	Base class for functions
CAOI_Function_Exponential	Exponential functions
CAOI_Function_Identity	Identity function
CAOI_Function_Postscript	Function defined using a PostScript program
CAOI_Function_Sampled	Function between 2 or more samples
CAOI_Function_Stitching	Combination of multiple functions
CAOI_Instance	Instance of the AOI engine
CAOI_Mapping	3x3 matrix
▼CAOI_Object	Base class for all graphic objects
CAOI_Object_Dimension	Dimensions and rulers
▼CAOI_Object_Group	Group, mask and transparency group
CAOI_Object_Layer	Layer
CAOI_Object_Raster	Image
▼CAOI_Object_Symbol	Symbol or form
CAOI_Object_MultiSymbol	Multiple impression of the same symbol or form
CAOI_Object_PlaceHolder	Template element
▼CAOI_Object_Vector	Base class for all vector graphics
CAOI_Object_Ellipse	Circle and ellipse
CAOI_Object_Multigon	Multigon
CAOI_Object_Path	Path
CAOI_Object_Rectangle	Rectangle
▼CAOI_Object_Text	Text object
CAOI_Object_PathText	Text along a path
CAOI_Object_Bitmap	BitmapT container
CAOI_Page	Page in the document
CAOI_Point	Coordinate
CAOI_Rectangle	Rectangle
CAOI_Renderer	Renderer / RIP
CAOI_Screener	Screener / halftoning
CAOI_SoftProofRenderer	Renderer / RIP
▼CAOI_Style	Base class for painting styles
CAOI_Style_Color	Color fill
CAOI_Style_Pattern	Pattern fill
▼CAOI_Style_Shading	Base class for shadings
▼CAOI_Style_Axial	Axial shading
CAOI_Style_Radial	Radial shading
CAOI_Style_CoonePatch	Coons patch shading
CAOI_Style_FunctionShading	Function based shading
CAOI_TextProperties	Text specifications
CAOI_TileSettings	Renderer / RIP
CColorConvert_Data	Color information for CMM callback
CAOI_Object_Group::SoftMask	SoftMask definition