Retrieves the value of the specified Event Domain Constant. If the constant does not exist or is an empty string, an optional default value will be returned (or an empty string if no default value is specified).
Note: If a Global Constant or a Company Constant has the same name as an Event Domain constant, the value of the Event Domain Constant overrides the value of the Global Constant or the Company Constant.
@event::getEventDomainConstant(String constantName[, String defaultReturnValue])
Value of the specified Event Domain Constant or the default value specified.
$domainName = @event::getEventDomainConstant("DOMAIN", "http://www.xmatters.com")
$content = $content & $domainName