displayRole versus displayFormat

[simoncn]

The 'artist' in this option is used in a technical sense and I understand why this could be confusing.

Historically, control points have used one of two alternative XML tags to receive composer information from the server. One of these is <upnp:artist role="composer"> and the other is <upnp:author role="composer">. The UPnP specification unfortunately doesn't define which of these should be used, so MinimServer provide the displayRole option of the tagCustom property to enable the user to specify which of these (or both, or neither) should be used. The correct choice would depend on which control point(s) the user is using.

A further wrinkle is that some control points doesn't understand either of these forms but just ignore the role="composer" attribute. This can cause composer names to be misinterpreted as artist names. (You are doing this intentionally but many users would not want this to happen.)

There are even more twists to this saga but I think the above is enough for now.