"Official" separator for multiple MB artist IDs?

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Could please someone tell me, what you actually use as “official” separator character for multiple MB artist ID in a ID3tag?

Example song: http://musicbrainz.org/recording/ed7f9237-98d3-4d91-bf66-f3acf7e73ce8

I talk about the “musicbrainz_artistid” or “TXXX:MusicBrainz Artist Id” according to this mapping table.

Should I use a comma, a Slash, a semicolon or something different?
Picard shows a Slash. But I’m not sure if this is for displaying only?