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Prevent displaying time conflicts between scheduled contents and even-driven contents

From: Gisung Kim <gskim@itc.kaist.ac.kr>
Date: Thu, 8 Nov 2012 17:17:45 +0900
Message-ID: <CAEf4oy2+rXWsQ2Do-KiuSx=15d9BKsTneUsz0F-gpj5V74jA4w@mail.gmail.com>
To: public-websignage@w3.org
Hi all,

How was your journey from Lyon to your country?

It was a touch flight from Lyon to Seoul. Hope you go back to your normal
life soon.

I would like to add a new requirement, 'Prevent displaying time conflicts
between scheduled contents and event-driven contents' that we discussed in

R. Prevent displaying time conflicts between scheduled contents and
even-driven contents

Digital signage contents consist of scheduled contents which are supposed
to be generally displayed on scheduled time and event-driven contents which
are activated by user interaction. Time conflicts can occur between them so
that it is necessary to provide a method to prevent the conflicts.

Use cases

[Prevent user interaction]

Monica is now in front of a digital signage. She tries to turn on a movie
clip on the signage, which lasts for 10 minutes.
However, the movie clip is not activated because the current content on the
display is about to be finished in 2 minutes and next content is strongly

scheduled to be started on time. After 2 minutes, the next content is
displayed on the display as scheduled.

[Postpone a scheduled content]

Lily is at a shopping center. She sees a digital signage and tries to get
shopping guides from the signage. The signage display enables her to touch
itself to

access to various shopping information. She interacts with the signage
while it has a schedule to display another advertisement at the time.
However, the

signage owner does not want to bother user interaction service so that
postpones the scheduled advertisement until she finishes her interaction.
When she leaves the signage, it starts to display the scheduled


There might be a time conflict between event driven contents and scheduled
Recently, digital signages are developed to be interactive so that they can
provide additional information (event driven contents) in response to user
Advertisers want a signage to display their paid advertisements (scheduled
contents) on time. Advertisement is a major funding source for digital
Therefore, it is required to handle this issue.

Gap analysis

In SMIL 3.0, there is a discussion of unifying event based and scheduled
timing for multimedia presentation.
To integrate interactive content into SMIL 3.0, SMIL 1.0 scheduler is
extended to support indeterminate timing and event-activation. See SMIL3.0


The issue is a little bit pertaining to R14, 'showing contents on time'. I
think the proposed issue should be seperated from R14, since it is
practically too important to be covered by R14. R14 even does not discuss
about event-driven contents.

I appreciate any comments or suggestions on the proposed issue.


Best regards,

Gisung Kim

Gisung Kim, Research Engineer / Ph.D

KAIST Institute for Information Technology Convergence
373-1 Kusong-dong, Yusong-gu
Daejeon 305-701, Republic of Korea.
Tel: +82-42-350-7137
Mobile: +82-10-9253-3843
Received on Thursday, 8 November 2012 08:18:14 UTC

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