A series of interests, each with the following format
Length
Description
1 byte
Parent or child interest. This is 0x01 if this is a parent (a group of interests), or 0x02 if this is a child (an interest).
1 byte
If this is a parent, then this is the ID of the group of interests. If it is a child, then this is the ID of the parent. If the ID is 0, then the interest is not in a group, it's just by itself.
2 bytes
Length L of the following
L bytes
The name of the interest or interest group (ex. "Cars," "Books and Writing," "Careers").