SMIL Scheduling
From SMIL for Digital Signage
SMIL playlists may be scheduled to play at specific times and repeat intervals. This is the single greatest difference between SMIL and other XML-based multimedia markup languages.
For details please see technical specification on Wallclock.
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Play at specific time each day
The following code starts a playlist between 9 AM and 12 noon each day.
<par dur="indefinite"> <seq begin="R/2000-01-01T09:00/P1D" end="R/2000-01-01T12:00/P1D"> ... </seq> </par>
A scheduled playlist MUST BE enclosed within a <par> section. If the schedule is valid forever, set the duration of the <par> to "indefinite."
The date 2000-01-01 gives a reference to a starting point in time, and can be any date in the past. "P1D" is the ISO-8601 designation for a repeat period of 1 day.
Play at a given day of week
Play between 9 AM and 12 noon on each Wednesday morning:
<par dur="indefinite"> <seq begin="R/2000-01-01T09:00+w3/P1W" end="R/2000-01-01T12:00+w3/P1W"> ... </seq> </par>
+w3 designates the 3rd weekday, or Wednesday. "P1W" repeats the schedule each week.
Play at a specific time
Play once on January 1, 2010, between 9 AM and 12 noon.
<par dur="indefinite"> <seq begin="2010-01-01T09:00" end="2010-01-01T12:00"> ... </seq> </par>
Note that "R" repeat designator is removed.
