A segment of the DTL stack. The complete DTL stack is formed
by traversing the rows of the table for which the csfFilterIndex
and csfRecordIndex are the same. Level transitions are indicated
using the csfDtlLinkType. Since the entries in the table are
linked to the entries of the csfFilterTable ,the entries are
added and removed from the table as and when the corresponding
entries in the csfFilterTable are added and removed.