2.9.10 BKFD
The BKFD structure is a BKF with additional information used for structured document tag bookmarks.
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bkf (6 bytes): A BKF specifying further information about the bookmark.
cDepth (4 bytes): An integer specifying the number of bookmarks in the document of the same type as the bookmark associated with this BKFD, the ranges of which overlap the beginning of the range of this bookmark. To increment the count, a bookmark MUST meet the following constraints:
The BKFD of the bookmark occupies the Plcbkfd containing this BKFD
The start CP (cpS) and limit CP (cpL) of the bookmark, as defined in the prose for that Plcbkfd and the Plcbkld it is paired with, satisfy the following in relation to the CP (cpCur) marking the beginning of the bookmark of this BKFD: cpS == cpCur == cpL || cpS <= cpCur < cpL
Because BKFD is associated only with structured document tag bookmarks, cDepth can be rephrased more simply as the one-based count of other structured document tag bookmarks in the file that contain the bookmark associated with this BKFD.