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<?php
/**
* Sequence Number Property
* @package qCal
* @copyright Luke Visinoni (luke.visinoni@gmail.com)
* @author Luke Visinoni (luke.visinoni@gmail.com)
* @license GNU Lesser General Public License
* @todo A lot of the conformance below relates more to the application making
* use of this library, but make sure to conform however possible.
*
* RFC 2445 Definition
*
* Property Name: SEQUENCE
*
* Purpose: This property defines the revision sequence number of the
* calendar component within a sequence of revisions.
* Value Type: integer
*
* Property Parameters: Non-standard property parameters can be
* specified on this property.
*
* Conformance: The property can be specified in "VEVENT", "VTODO" or
* "VJOURNAL" calendar component.
*
* Description: When a calendar component is created, its sequence
* number is zero (US-ASCII decimal 48). It is monotonically incremented
* by the "Organizer's" CUA each time the "Organizer" makes a
* significant revision to the calendar component. When the "Organizer"
* makes changes to one of the following properties, the sequence number
* MUST be incremented:
*
* . "DTSTART"
*
* . "DTEND"
*
* . "DUE"
*
* . "RDATE"
*
* . "RRULE"
*
* . "EXDATE"
*
* . "EXRULE"
*
* . "STATUS"
*
* In addition, changes made by the "Organizer" to other properties can
* also force the sequence number to be incremented. The "Organizer" CUA
* MUST increment the sequence number when ever it makes changes to
* properties in the calendar component that the "Organizer" deems will
* jeopardize the validity of the participation status of the
* "Attendees". For example, changing the location of a meeting from one
* locale to another distant locale could effectively impact the
* participation status of the "Attendees".
*
* The "Organizer" includes this property in an iCalendar object that it
* sends to an "Attendee" to specify the current version of the calendar
* component.
*
* The "Attendee" includes this property in an iCalendar object that it
* sends to the "Organizer" to specify the version of the calendar
* component that the "Attendee" is referring to.
*
* A change to the sequence number is not the mechanism that an
* "Organizer" uses to request a response from the "Attendees". The
* "RSVP" parameter on the "ATTENDEE" property is used by the
* "Organizer" to indicate that a response from the "Attendees" is
* requested.
*
* Format Definition: This property is defined by the following
* notation:
*
* seq = "SEQUENCE" seqparam ":" integer CRLF
* ; Default is "0"
*
* seqparam = *(";" xparam)
*
* Example: The following is an example of this property for a calendar
* component that was just created by the "Organizer".
*
* SEQUENCE:0
*
* The following is an example of this property for a calendar component
* that has been revised two different times by the "Organizer".
*
* SEQUENCE:2
*/
class qCal_Property_Sequence extends qCal_Property {
protected $type = 'INTEGER';
protected $allowedComponents = array('VEVENT','VTODO','VJOURNAL');
}