Re: Discussion on Bug 119639, the requirement conflicts with ODF standard

[Oliver-Rainer Wittmann <or...@googlemail.com>]

Hi,

On 23.07.2012 15:17, Rob Weir wrote:
> On Fri, Jul 20, 2012 at 2:11 AM, Clarence GUO <cl...@gmail.com> wrote:
>> HI~
>> I'm investigating bug 119639. Basically I need ODF standard to support
>> chart:percentage attribute not only in <chart:plot-area> applied style but
>> also in <chart:series> applied style. However ODF v1.2 says for
>> chart:percentage attribute "This attribute is evaluated for chart styles
>> that are applied to a <chart:plot-area> element.". So the requirement is
>> conflict with the ODF standard. So is there any method can satisfy my
>> requirement without ODF standard change? The details please reference below
>> explanation. I also post it as comment to this bug.
>>
>
> Two possibilities:
>
> 1) Generally we should avoid reinterpreting existing ODF
> elements/attributes.  But if we believe that something in ODF is
> ambiguous or wrong, then we can make a proposal to the OASIS ODF TC to
> adjust the meaning of existing ODF markup.  The main restriction here
> is that the ODF TC will generally not make changes that would break
> existing documents or implementations.
>
> 2) If we need to make a bigger change, ODF allows implementors to
> extend it.  So we can add new elements and attributes, but they cannot
> be in an ODF namespace.   We need to put the new markup in our own XML
> namespace.
>

Here, I would like to share my presentation which I gave at the OOoCon 2010 in 
Budapest [1] - especially subtopic "ODF Conforming Development"

[1] http://people.apache.org/~orw/210-209-1-PB.pdf

Best regards, Oliver.

> If we need to extend ODF I'd recommend also:
>
> a) We track on a special wiki page exactly what additions we make to
> the document format.
>
> b) We think carefully about backwards compatibility and how the new
> markup will be treated by other applications
>
> c) If we think the new feature would be useful to other editors we can
> propose adding it to ODF 1.3, as an official part of the standard.
>
> -Rob
>
>> The chart in the sample is not a standard chart but a composite chart.
>> Series 1, 2 and 4 are percent stacked columns which were applied to the
>> main Y axis, while series 3 is normal column which was applied to the
>> secondary Y axis. So series 3 will cover some part of Series 1, 2 and 4.
>> MS Office supports such chart. It can set one or more data series to
>> another chart type. AOO's UI cannot do this. But the chart kernal function
>> supports. So when open the sample file the chart looks OK. However, the ODF
>> format doesn't support this, that why after save the sample to ods and
>> reopen, the chart becomes incorrect(Series 3 occupy 100% space of the
>> percent stacked column).
>> The reason is AOO defined a style 'ch4' and applied to <chart:plot-area>.
>> In this style, the chart:percentage attribute was set to true. This
>> attribute specifies a percentage accumulation of values per category.
>> Because this style was applied to <chart:plot-area>, then all data series
>> are regarded as percent columns. And series 3 is a unique data series which
>> applied to the secondary Y axis. So it occpy the total 100% space so that
>> other data series are all covered.
>> If want to fix this defect, must move chart:percentage attribute from the
>> style which applied to <chart:plot-area> to the style which applied to
>> <chart:series>. However, for this attribute, ODF 1.2 says "This attribute
>> is evaluated for chart styles that are applied to a <chart:plot-area>
>> element.". So my requirement is conflict with the ODF standard.
>> Then how can I fix this defect? It seems the only way is to change the
>> standard and change the corresponding filter code. But I know change the
>> standard is not easy...