[1] SMIL Timesheets 1.0 ( (2012-03-29 03:27:58 +09:00 版)) http://www.w3.org/TR/2012/NOTE-timesheets-20120328/

[2]

Synchronized Multimedia Activity Statement (2012-04-05 02:41:58 +09:00) https://www.w3.org/AudioVideo/Activity.html

the Timesheets 1.0 standalone Working Draft now in Last Call since 10 January 2008. It was published as a Timesheets 1.0 Working Group NOTE on 28 March 2012 on closure of the SYMM WG.

[3] SMIL Timesheets 1.0 (2012-03-28 17:43:44 +09:00) https://www.w3.org/TR/2008/WD-timesheets-20080110/