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<?php
/**
* Exception Date/Times 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 allowedComponents is correct. The RFC isn't dead clear.
* Perhaps this means that it can be included in any component that
* includes an rdate or rrule property?
*
* RFC 2445 Definition
*
* Property Name: EXDATE
*
* Purpose: This property defines the list of date/time exceptions for a
* recurring calendar component.
*
* Value Type: The default value type for this property is DATE-TIME.
* The value type can be set to DATE.
*
* Property Parameters: Non-standard, value data type and time zone
* identifier property parameters can be specified on this property.
*
* Conformance: This property can be specified in an iCalendar object
* that includes a recurring calendar component.
*
* Description: The exception dates, if specified, are 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" property 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 then 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 "EXDATE" 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:
*
* exdate = "EXDATE" exdtparam ":" exdtval *("," exdtval) CRLF
*
* exdtparam = *(
*
* ; the following are optional,
* ; but MUST NOT occur more than once
*
* (";" "VALUE" "=" ("DATE-TIME" / "DATE")) /
* (";" tzidparam) /
*
* ; the following is optional,
* ; and MAY occur more than once
*
* (";" xparam)
*
* )
*
* exdtval = date-time / date
* ;Value MUST match value type
*
* Example: The following is an example of this property:
*
* EXDATE:19960402T010000Z,19960403T010000Z,19960404T010000Z
*/
class qCal_Property_Exdate extends qCal_Property_MultiValue {
protected $type = 'DATE-TIME';
protected $allowedComponents = array('VEVENT','VTODO','VJOURNAL','VTIMEZONE');
}