+ AA6YQ comments below

I'm almost certain that LOTW, eQSL, etc store all those logs in a relational 
database of some sort, so, yes, at some point, all those contacts are stored in 
a datastructure...

+ Correct, but the representation of modes in those data structures is entirely 
independent of ADIF. My logging application (DXLab) represents FT4 QSOs with a 
Mode field that contains FT4. It's the import and export logic that takes care 
of correctly importing a QSO record and correctly exporting a QSO record.


Unless you're inferring that the ARRL has a single monolithic .adif  *file* 
somewhere that's got EVERYBODY's logs stored chronologically?

+ No, they don't.

         73,

               Dave, AA6YQ




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