[B]
[..]
BEFORE_HEADER
BEGIN
BIG_ENDIAN
BINTERNAL
BKT
BLEAF
BOTH_FILTER
BRACED_CODE
BTDATAOFF
BTMETA
BTREE
BTREEINFO
BTREEMAGIC
BTREEVERSION
BUF_PUSH
BUF_PUSH_2
BUF_PUSH_3
BYTEWIDTH
BYTE_ORDER
[..]