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Subject: Re: [office] Re: [office-accessibility] Re: [office] use cases for"is-subtable" attribute

Hi Rich,

Thanks for the explanation. I agree, that for the case shown in the 
document, implementing this via subtables leads to confusing cell 
addresses. This is because sub-tables were used to implement the 
_merging_ of cells. OpenOffic.org Writer indeed used to implement table 
cell merges like this. OpenOffice.org Calc did and does not. It uses 

Most of the subtable discussion right now is around the subdivision, 
partitioning or splitting of cells. Note that there is no user interface 
function in OpenOffice.org Calc to do this. The initial table grid 
represents the minimal partitioning. You can only merge cells, so if you 
want the effect of a split, you'd need to merge all other cells.

I think there is consensus about subtables being inappropriate for the 
representation of merged cells.

However, some feel that being able to partition a table cell by 
inserting a subtable and having this subtable's border be defined by the 
enclosing cell's border is useful too. Hence the suggestion to not 
generally depreciate the is-subtable attribute but to explicitly state 
in which circumstances it is deprecated, viz. to represent merged cells.


Richard Schwerdtfeger wrote:
> Lars,
> The bottom line is a blind user is navigating a spreadsheet and when you 
> drop in a subtable the reference to the cells does not match the 
> underlying header. Blind users use the grid structure and headings to 
> maintain a point of reference. When that is not consistent the user gets 
> lost. We ran into this problem working with freedom scientific and our 
> ODF 1.1 support by the Notes 8 Productivity Editors. The JAWS developer, 
> who is blind, got lost and asked that we correct the issue.
> Please see section 3.3 of this document. It is pretty self explanatory. 
> Here you will see the use .B2.B1 under a row header of C1. The user is lost.
> http://www.oasis-open.org/apps/org/workgroup/office-accessibility/download.php/24546/ODF_Accessibility_Guidelines_26_5July2007.odt
> Hope this answers your question.
> Cheers,
> Rich
> Rich Schwerdtfeger
> Distinguished Engineer, SWG Accessibility Architect/Strategist
> Chair, IBM Accessibility Architecture Review Board
> blog: http://www.ibm.com/developerworks/blogs/page/schwer
> Inactive hide details for "Dave Pawson" <dave.pawson@gmail.com>"Dave 
> Pawson" <dave.pawson@gmail.com>
>                         *"Dave Pawson" <dave.pawson@gmail.com>*
>                         07/09/2007 12:23 PM
> To
> "Lars Oppermann" <Lars.Oppermann@sun.com>
> cc
> "OASIS Office" <office@lists.oasis-open.org>, 
> office-accessibility@lists.oasis-open.org
> Subject
> [office-accessibility] Re: [office] use cases for "is-subtable" attribute
> On 09/07/07, Lars Oppermann <Lars.Oppermann@sun.com> wrote:
>  > Hi Dave,
>  >
>  > Could you elaborate a bit more on the reasons why a nested table is a
>  > problem for access technology? From my (naive) point of view, it would
>  > appear somewhat more confusing to navigate a lot of spanned cells rather
>  > than entering a subtable.
> Suggestion.
> Find a friendly access technology user, perhaps a blind person?
> Ask them how table navigation works.
> If you sit alongside them, they can guide you through table navigation.
> Better still, put on a blindfold and try it for yourself.
> cell spanning has been around for a while.
> sub-tables seems to be an ODF invention?
> Either believe the accessibility sub-committee or find out from an end user.
> I'm sure Peter or Rich can introduce you to an AT user if you ask nicely.
> regards
> -- 
> Dave Pawson
> http://www.dpawson.co.uk

Sun Microsystems                Lars Oppermann <lars.oppermann@sun.com>
Nagelsweg 55                    Software Engineer
20097 Hamburg, Germany          Phone: +49 40 23646 959
http://www.sun.com/             Fax:   +49 40 23646 550
Sitz der Gesellschaft: Sun Microsystems GmbH, Sonnenallee 1,
D-85551 Kirchheim-Heimstetten, Amtsgericht Muenchen: HRB 161028
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Vorsitzender des Aufsichtsrates: Martin Haering

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