Here are the data structures with brief descriptions:

C_ExifContent
C_ExifData	Represents the entire EXIF data found in an image
C_ExifEntry	Data found in one EXIF tag
C_ExifMnoteData
C_ExifMnoteDataMethods
CExifRational	EXIF Unsigned Rational data type
CExifSRational	EXIF Signed Rational data type