delimiter for list items

The Schema 1.0 only allows whitespace as the delimiter for the items.
However, many existing scripts allow other delimiters, such as ',', ':'.
It may be useful to allow users to define the delimiter in a list.

Thanks!

-Xiaotao

=========================================================
Name  : Xiaotao Wu
Email : xiaotaow@cs.columbia.edu, xw71@columbia.edu
URL   : http://www.cs.columbia.edu/~xiaotaow
Phone : (212)939-7020, (212)939-7133,  Fax: (801)751-0217
SIP   : sip:xiaotaow@conductor.cs.columbia.edu
Office: Room 463, Mudd building, West 120th
=========================================================