Return the number of seconds for a time expression.
time
A TTML time expression.
This template takes a time expression as used by the begin
, end
, and dur
attributes and returns the number of seconds that expression respresents. Time expressions may be any number parsable by the XPath number
function followed by one of the units ms
(milliseconds), s
(seconds), m
(minutes), or h
(hours). It returns 0
if the time expression is invalid.
This template provides support only for the #time-offset
TTML feature. It does not support other methods of specifying times.