…the "section" enum is of much importance. I don't believe anything in particular is done with with it.

```cpp
    /*!
      @brief Section identifiers to logically group tags. A section consists
             of nothing more than a name, based on the Exif standard.
     */
    enum SectionId { sectionIdNotSet,
                     imgStruct, recOffset, imgCharacter, otherTags, exifFormat,
                     exifVersion, imgConfig, userInfo, relatedFile, dateTime,
                     captureCond, gpsTags, iopTags, mpfTags, makerTags, dngTags, panaRaw,
                     tiffEp, tiffPm6, adobeOpi,
                     lastSectionId };
```

I pleased with the documentation and drawing I have added to the book concerning the Exif Specification.

https://clanmills.com/exiv2/book/#Exif

…/approve.

Handle more TIFF/EP vs Exif differences

Moved translated values (GPS, Exif) closer to their respective lists