Defines a catalog variable that will be available in the current catalog
with the notation __Variable__. Variable identifiers must begin with a
capital letter, and can contain only word characters (A-Z,a-z,0-9 and underscore). These are substituted second (right after global
Variables) in any MiniVend page, and can contain any valid MiniVend tags
except global variables.
Variable DOCUMENT_ROOT /usr/local/etc/httpd/htdocs