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Value Name

PERIOD

Purpose

This value type is used to identify values that contain a precise period of time.

Format Definition

This value type is defined by the following notation:

 period     = period-explicit / period-start

 period-explicit = date-time "/" date-time
 ; [ISO.8601.2004] complete representation basic format for a
 ; period of time consisting of a start and end.  The start MUST
 ; be before the end.

 period-start = date-time "/" dur-value
 ; [ISO.8601.2004] complete representation basic format for a
 ; period of time consisting of a start and positive duration
 ; of time.
Description:  If the property permits, multiple "period" values are
specified by a COMMA-separated list of values.  There are two
forms of a period of time.  First, a period of time is identified
by its start and its end.  This format is based on the
[ISO.8601.2004] complete representation, basic format for "DATE-
TIME" start of the period, followed by a SOLIDUS character
followed by the "DATE-TIME" of the end of the period.  The start
of the period MUST be before the end of the period.  Second, a
period of time can also be defined by a start and a positive
duration of time.  The format is based on the [ISO.8601.2004]
complete representation, basic format for the "DATE-TIME" start of
the period, followed by a SOLIDUS character, followed by the
[ISO.8601.2004] basic format for "DURATION" of the period.

Example

The period starting at 18 ending at 07:00:00 UTC on January 2, 1997 would be:

 19970101T180000Z/19970102T070000Z

The period start at 18:00:00 on January 1, 1997 and lasting 5 hours and 30 minutes would be:

 19970101T180000Z/PT5H30M

No additional content value encoding (i.e., BACKSLASH character encoding, see Section 3.3.11) is defined for this value type.

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