plz help me

i have a 3 fields in my xml document, like....  name, age , group

groups are again 3 like min , max, highmax........

min group contains  some fields like,  group name, group no, so on ......

max group contains like   group name, total mem........

highmax contains  like  group name,  gender, type of num.......


how can i create xml schema for above problem.......

plz help me