Comments on: SMIL3.0 W3C Working Draft 13 July 2007

    8.3 SMIL 3.0 BasicText Module


      8.3.1 Elements and Attributes

....

The elements defined in this module are:

smilText 
<http://www.w3.org/TR/2007/WD-SMIL3-20070713/smil-text.html#edef-smilText>
tev 
<http://www.w3.org/TR/2007/WD-SMIL3-20070713/smil-text.html#edef-textTev>
clear 
<http://www.w3.org/TR/2007/WD-SMIL3-20070713/smil-text.html#edef-textClear>
br <http://www.w3.org/TR/2007/WD-SMIL3-20070713/smil-text.html#edef-br>

The attributes defined in this module are:

begin 
<http://www.w3.org/TR/2007/WD-SMIL3-20070713/smil-text.html#adef-textBegin>
next 
<http://www.w3.org/TR/2007/WD-SMIL3-20070713/smil-text.html#adef-textNext>

....


        The tev Element

The tev 
<http://www.w3.org/TR/2007/WD-SMIL3-20070713/smil-text.html#edef-textTev> 
element defines a "temporal moment" within a block of smilText content. 
Depending on the values of the begin 
<http://www.w3.org/TR/2007/WD-SMIL3-20070713/smil-text.html#adef-textBegin> 
or next 
<http://www.w3.org/TR/2007/WD-SMIL3-20070713/smil-text.html#adef-textNext> 
attributes, it determines a scheduling time at which the associated text 
content (up to the following tev 
<http://www.w3.org/TR/2007/WD-SMIL3-20070713/smil-text.html#edef-textTev> 
or clear 
<http://www.w3.org/TR/2007/WD-SMIL3-20070713/smil-text.html#edef-textClear> 
element or the end of the smilText 
<http://www.w3.org/TR/2007/WD-SMIL3-20070713/smil-text.html#edef-smilText> 
element) is rendered. This element does not define a content container, 
but is simply a temporal marker within a text fragment.


        ______________________________________________________________
        Comment:

It is unclear what should happen when in a tev 
<http://www.w3.org/TR/2007/WD-SMIL3-20070713/smil-text.html#edef-textTev> 
element
both begin 
<http://www.w3.org/TR/2007/WD-SMIL3-20070713/smil-text.html#adef-textBegin> 
and next 
<http://www.w3.org/TR/2007/WD-SMIL3-20070713/smil-text.html#adef-textNext> 
attributes are present, none of these
are present, or multiple of these are present.
Same for clear 
<http://www.w3.org/TR/2007/WD-SMIL3-20070713/smil-text.html#edef-textClear> 
element.


        ______________________________________________________________


....


        The begin Attribute

    This attribute defines an absolute time, relative to the beginning
    of the parent smilText
    <http://www.w3.org/TR/2007/WD-SMIL3-20070713/smil-text.html#edef-smilText>
    element, when the associated tev
    <http://www.w3.org/TR/2007/WD-SMIL3-20070713/smil-text.html#edef-textTev>
    or clear
    <http://www.w3.org/TR/2007/WD-SMIL3-20070713/smil-text.html#edef-textClear>
    element becomes active.
    The attribute value is a semi-colon separated list of begin-values:

    begin-value : ( clock-value | event-value )
        Defines the element's begin time.
    Clock-value
    <http://www.w3.org/TR/2007/WD-SMIL3-20070713/smil-timing.html#Timing-ClockValueSyntax>
        Describes the element begin as a non-negative offset from the
        start of the element's smilText container. The offset is
        measured in parent simple time.
    ...


    The general semantics of this element are the same as the SMIL begin
    attribute defined within the timing module, with the restriction
    that only a subset of potential time values are supported.


        ______________________________________________________________
        Comment:

It is unclear which subset of potential time values is referred to.


        ______________________________________________________________