Group Code 71 and Block def's

Can anyone explain to me what the (assoc 71) is in a Block Definition? It is
not listed in the DXF reference as being a member of a Block def., yet I
seem to have found a few blocks that have it and using (entmod) on them to
change the layer fails. Below are the results of (entget) on 2 blocks. The
first exhibits the (71 . 1) while the second does not.......

Command: (setq test (entget (tblobjname "block" "test")))
((-1 . <Entity name: 400a0f80>) (0 . "BLOCK") (330 . <Entity name:
400a0f68>)
(5 . "860") (100 . "AcDbEntity") (67 . 0) (8 . "old-one") (62 . 7) (6 .
"Continuous") (370 . 0) (100 . "AcDbBlockBegin") (70 . 0) (71 . 1) (10 0.0
0.0
0.0) (-2 . <Entity name: 400a0f88>) (2 . "TEST") (1 . ""))

Command: (entget (tblobjname "block" "car"))
((-1 . <Entity name: 400a2708>) (0 . "BLOCK") (330 . <Entity name:
400a2528>)
(5 . "961") (100 . "AcDbEntity") (67 . 0) (8 . "0") (100 . "AcDbBlockBegin")
(70 . 0) (10 0.0 0.0 0.0) (-2 . <Entity name: 400a2530>) (2 . "CAR") (1 .
""))

Thanks,

 

Hi...

The code 71 is row of minsert and also attributes and text.

 

Note, this is NOT an insert, but the block definition itself......