<?php
/**
 * Time Zone Offset From Property
 * @package qCal
 * @copyright Luke Visinoni (luke.visinoni@gmail.com)
 * @author Luke Visinoni (luke.visinoni@gmail.com)
 * @license GNU Lesser General Public License
 * @todo Make sure that the various components that require this actually
 * require it.
 * 
 * RFC 2445 Definition
 * 
 * Property Name: TZOFFSETFROM
 * 
 * Purpose: This property specifies the offset which is in use prior to
 * this time zone observance.
 * 
 * Value Type: UTC-OFFSET
 * 
 * Property Parameters: Non-standard property parameters can be
 * specified on this property.
 * 
 * Conformance: This property MUST be specified in a "VTIMEZONE"
 * calendar component.
 * 
 * Description: This property specifies the offset which is in use prior
 * to this time observance. It is used to calculate the absolute time at
 * which the transition to a given observance takes place. This property
 * MUST only be specified in a "VTIMEZONE" calendar component. A
 * "VTIMEZONE" calendar component MUST include this property. The
 * property value is a signed numeric indicating the number of hours and
 * possibly minutes from UTC. Positive numbers represent time zones east
 * of the prime meridian, or ahead of UTC. Negative numbers represent
 * time zones west of the prime meridian, or behind UTC.
 * 
 * Format Definition: The property is defined by the following notation:
 * 
 *   tzoffsetfrom       = "TZOFFSETFROM" frmparam ":" utc-offset
 *                        CRLF
 * 
 *   frmparam   = *(";" xparam)
 * 
 * Example: The following are examples of this property:
 * 
 *   TZOFFSETFROM:-0500
 * 
 *   TZOFFSETFROM:+1345
 */
class qCal_Property_Tzoffsetfrom extends qCal_Property {

	protected $type = 'UTC-OFFSET';
	protected $allowedComponents = array('VTIMEZONE','DAYLIGHT','STANDARD');

}