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<?php
/**
* Exception Rule 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 allowedCompoents is correct. The RFC isn't dead clear
* See the todo for EXDATE
*
* RFC 2445 Definition
*
* Property Name: EXRULE
*
* Purpose: This property defines a rule or repeating pattern for an
* exception to a recurrence set.
*
* Value Type: RECUR
*
* Property Parameters: Non-standard property parameters can be
* specified on this property.
*
* Conformance: This property can be specified in "VEVENT", "VTODO" or
* "VJOURNAL" calendar components.
*
* Description: The exception rule, if specified, is used in computing
* the recurrence set. The recurrence set is the complete set of
* recurrence instances for a calendar component. The recurrence set is
* generated by considering the initial "DTSTART" property along with
* the "RRULE", "RDATE", "EXDATE" and "EXRULE" properties contained
* within the iCalendar object. The "DTSTART" defines the first instance
* in the recurrence set. Multiple instances of the "RRULE" and "EXRULE"
* properties can also be specified to define more sophisticated
* recurrence sets. The final recurrence set is generated by gathering
* all of the start date-times generated by any of the specified "RRULE"
* and "RDATE" properties, and excluding any start date and times which
* fall within the union of start date and times generated by any
* specified "EXRULE" and "EXDATE" properties. This implies that start
* date and times within exclusion related properties (i.e., "EXDATE"
* and "EXRULE") take precedence over those specified by inclusion
*
*
* properties (i.e., "RDATE" and "RRULE"). Where duplicate instances are
* generated by the "RRULE" and "RDATE" properties, only one recurrence
* is considered. Duplicate instances are ignored.
*
* The "EXRULE" property can be used to exclude the value specified in
* "DTSTART". However, in such cases the original "DTSTART" date MUST
* still be maintained by the calendaring and scheduling system because
* the original "DTSTART" value has inherent usage dependencies by other
* properties such as the "RECURRENCE-ID".
*
* Format Definition: The property is defined by the following notation:
*
* exrule = "EXRULE" exrparam ":" recur CRLF
*
* exrparam = *(";" xparam)
*
* Example: The following are examples of this property. Except every
* other week, on Tuesday and Thursday for 4 occurrences:
*
* EXRULE:FREQ=WEEKLY;COUNT=4;INTERVAL=2;BYDAY=TU,TH
*
* Except daily for 10 occurrences:
*
* EXRULE:FREQ=DAILY;COUNT=10
*
* Except yearly in June and July for 8 occurrences:
*
* EXRULE:FREQ=YEARLY;COUNT=8;BYMONTH=6,7
*/
class qCal_Property_Exrule extends qCal_Property {
protected $type = 'RECUR';
protected $allowedComponents = array('VEVENT','VTODO','VJOURNAL');
protected $allowMultiple = true;
}