Hi Currently info packets are list of streams list of name/type/value triplets i would suggest that we change this to first name/type/value is the "name/id" of what is described remander is a list of descriptions and require that any 2 info packets with the same name/id be identical one case where the current variant is unclear is ChapterId=5 StartTime=1min StopTime=2min does this mean Chapter 5 is from 1min to 2min or that the info packet describes the time from 1min to 2min of chapter 5? for my suggestion it would be Chapter 5 --- StartTime=1min StopTime=2min vs. TimeSpan 123 --- Chapter=5 StartTime=1min StopTime=2min the following is the simplest way to store things i could come up with: count v for(i=0; i<count; i++){ x v name vb if(x==0){ type vb value vb }else if(x==1){ type= "UTF-8" value vb }else{ type= "rational" value.num s value.den= x-1 } } -- Michael