Q about custom pricing message above

[Lee Nelson <jld123@pobox.com>]

To All,

  First let me say thanks to Mike for the response
about GPG.

  I just posted a solution I came up with for custom
pricing to the list.  It was derived from a piece of
code that I found in the list archives. 
 
  I use $Vend::Interpolate::item to access various
data members for the current shopping cart item.  The
problem is I would like to know what the complete
list of data members is.  Currently, I only know about:

  item{quantity}
  item{code}
  item{price_group}

  Can someone post a more complete list?  I would 
specifically like to know how to access the value of
item-modifers.

  I tried grepping the code without much success.

  Thanks much,

     Lee Nelson