PS – Brian didn’t invent the ‘electronic’ media type. It’s a standard part of the GEDCOM specification:
[ audio | book | card | electronic | fiche | film | magazine |
manuscript | map | newspaper | photo | tombstone | video ]
A code, selected from one of the media classifications choices above, that indicates the type of
material in which the referenced source is stored.
They don’t specify what its purpose was meant to be though, so it’s your choice.