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Re: SVG12: seeking requirements

From: Craig Northway <craign@cisra.canon.com.au>
Date: Sat, 30 Apr 2005 08:51:59 +1000
Message-ID: <4272BA8F.9080107@cisra.canon.com.au>
To: Bjoern Hoehrmann <derhoermi@gmx.net>
Cc: www-svg@w3.org

Bjoern,

Bjoern Hoehrmann wrote:

>* Craig Northway wrote:
>  
>
>>The working group have discussed this again. This will be clearly 
>>dissallowed. The UA must not reinsert elements when the document seeks 
>>backwards. If you are satisfied with this the text will now read:
>>
>>   Seeking backwards in the timeline must not re-insert the discarded
>>   elements. Discarded elements are intended to be completely removed
>>   from memory. So, authors are encouraged to set the 'playbackOrder'
>>   attribute to forwardOnly when using the 'discard' element.
>>    
>>
>
>This change alone does not satisfy me, the draft would then contradict
>the definition of the element which states that discarding an element
>is equivalent to calling removeChild() which would no longer be true as
>user agents are not prohibed from re-inserting nodes removed via that
>method when seeking.
>
Excuse me? They are explicitly prohibited from re-inserting nodes. This 
method now works exactly like calling removeChild/Node() from a script. 
If the element is removed and you seek backwards past its removal time, 
it does not reappear.

I quote from my earlier reply:

 *Seeking backwards in the timeline must not re-insert the discarded elements.*

How clear can this be!

> I suggest to add a new section or sub-section that
>clearly defines requirements for seeking which would then be linked from
>the discard element definition (as I requested).
>  
>
Yes, we could add a reference to SMIL from the discard element prose.

Regards,
Craig
Received on Friday, 29 April 2005 22:52:12 GMT

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