To help me get an idea of the frames I have to parse in id3v2, I've made up a frame fields chart.

Remember that frames hierarchy I was talking about the other day? It's a recursive map of maps to store frames to ensures that I don't write over a frame with another with the same id.

About half of the frame types in the spec allow more than one frame with the same frame id. You have to parse the beginning of the frame to get to these fields to differentiate between them. I've marked those fields in the chart too.

The chart is almost complete, but there are a few question marks.

Update 1:05pm chart is done now.