Re: textDecoration question

Just added a note (in 8.2.19) and changed schema data type to xs:string.


On Mon, May 13, 2013 at 8:45 AM, Michael Dolan <mdolan@newtbt.com> wrote:

> I’d suggest adding text clarifying this and of course, the schema should
> be fixed.****
>
> ** **
>
> *From:* Glenn Adams [mailto:glenn@skynav.com]
> *Sent:* Sunday, May 12, 2013 5:50 PM
> *To:* Michael A Dolan
> *Cc:* public-tt
> *Subject:* Re: textDecoration question****
>
> ** **
>
> ** **
>
> On Fri, Jun 22, 2012 at 6:00 PM, Michael A Dolan <mdolan@newtbt.com>
> wrote:****
>
> The prose for this attribute is not clear whether combinations of the
> pairs of attributes can be used.  The examples show only a single value at
> a time – e.g. either underline or lineThrough.****
>
>  ****
>
> The syntax is constructed in an unusual manner if the intent was to only
> permit a single value.  The schema is currently an enumeration, forcing
> only a single value.****
>
> ** **
>
> To understand the notation, you have to trace back to XSL-FO and thence to
> CSS 2. See [1].****
>
> ** **
>
> [1] http://www.w3.org/TR/CSS2/about.html#value-defs****
>
> ** **
>
> Specifically:****
>
> ** **
>
> A double bar (||) separates two or more options: one or more of them must
> occur, in any order.****
>
> ** **
>
> This would probably be more clear if someone hadn't removed the references
> to the XSL-FO definitions upon which the properties were based, though you
> can still trace it via Appendix J.2 Attribute Derivation [2].****
>
> ** **
>
> [2]
> https://dvcs.w3.org/hg/ttml/raw-file/default/ttml10/spec/ttaf1-dfxp.html#attribute-vocab-derivation-table
> ****
>
> ** **
>
> In any case, the intent is *not* to permit a single value, e.g.,
> "underline overline noLineThrough" is a valid value.****
>
> ** **
>
>  ****
>
> If the schema is correct, then one can never apply both underline and
> lineThrough concurrently – e.g. textDecoration=”underline lineThrough”.***
> *
>
>  ****
>
> Does the schema reflect the intent?  If so, then why the odd construction
> of the syntax in the prose?****
>
>  ****
>
> Thanks,****
>
>  ****
>
>                 Mike****
>
>  ****
>
> Michael A DOLAN****
>
> Television Broadcast Technology, Inc****
>
> PO Box 190, Del Mar, CA 92014 USA****
>
> +1-858-882-7497 (m)****
>
>  ****
>
> ** **
>