[linux-lvm] vg attributes (vg_attr) in vgs program don't seem to match the man page

[ben scott]

The explanation of the attribute bits printed by the program "vgs" in the man 
page are as follows:

The vg_attr bits are:  (w)riteable, (r)ead only, resi(z)eable, e(x)ported, 
(p)artial and (c)lustered.

However "vgs" on my debian Etch system prints out this way:

wz--n-


  LVM version:     2.02.07 (2006-07-17)
  Library version: 1.02.12 (2006-10-13)
  Driver version:  4.7.0


Could someone please explain to me what the "n" stands for and which columns 
get the other bits. I am trying to write a parser for this output. 

Thank you.