RE: [CSS21] double bar regex syntax - Please disregard

My apologies. I just found the answer in section 1 of the spec. Please disregard. 

From: zxcv_890@hotmail.com
To: www-style@w3.org
Date: Thu, 2 Jun 2011 08:18:02 -0700
Subject: [CSS21] double bar regex syntax








Hi,
What does the double bar mean (as opposed to the single bar)? Example:

[<'background-color'> || <'background-image'> || <'background-repeat'>
|| <'background-attachment'> || <'background-position'>] | inherit

I couldn't find anything with a Google search.

My only guess is 
|| inclusive or 
| exclusive or