I'm suggesting that newer developers will find Exif to be quite different from hierarchical file formats that use delimiters between data elements, as is common practice lately with XML / JSON / YAML / etc. And it is technically somewhat challenging to manipulate Exif using the most popular high-level languages. Obviously competent developers can overcome these challenges.
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That sounds exactly like a file format to me. Are you suggesting that json is the only format developers might be aware of?
I'm suggesting that newer developers will find Exif to be quite different from hierarchical file formats that use delimiters between data elements, as is common practice lately with XML / JSON / YAML / etc. And it is technically somewhat challenging to manipulate Exif using the most popular high-level languages. Obviously competent developers can overcome these challenges.