ID3 version 2.3 specifies that multi-values are allowed in several types of text frame, separated by the "/" character. This includes the TCOM and TPE1 frames that Twonky reads (as upnp:artist and upnp:author). But Twonky ignores these delimitors.
However: it seems that Twonky DOES support multi-values in the TCON frame (mapped to upnp:genre) even though this is not specified by ID3 version 2.3. Twonky uses "," as the delimitor.
ID3 version 2.4 states that "All text information frames support multiple strings, stored as a null separated list, where null is represented by the termination code for the character encoding". The Revision History for Twonky Server v5 states "correctly recognizes ID3V2.4 compliant tags". But so far as I can see, Twonky ignores all data following a null.
My collection is of classical music, where multi-values are valuable for recording Artist information. I have got around the Twonky limitations by tagging Artists in the TCON frame (I've put Genre in the TPE2 frame). I have created a 'view' to reflect this mapping.
Multi-Value Tags in release 5.0.61
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john.glasson
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