6. The method of claim 4 wherein the topic descriptor weight is determined based on at least one of an importance factor, a privacy factor, and a cost factor.
6. The method of claim 4 wherein the topic descriptor weight is determined based on at least one of an importance factor, a privacy factor, and a cost factor. 7. The method of claim 6 wherein at least one of the importance factor, the privacy factor, and the cost factor is weighted.