The issue here is the knock-on effect on calculated values. The simple solution is not to record calculated values in tracked changes... there is an argument to say they should not be in the interchange format at all because they are redundant... but that is a separate issue!
But your point is a good one and would need to be resolved. A possible solution is that the specification identifies derived values and these could be ignored for CT purposes, as indeed they are in the current solution. This does not seem to be a difficult rule to define or to implement.
Regards,
Robin
Frank Meies wrote:
4D9DAB6D.1080602@oracle.com" type="cite"> Hi all,
thinking about CT in spreadsheet tables, I was wondering about how this is supposed to be handled by the generic proposal and whether the current way to track changes is compatible with Excel.
Although the generic proposal is able to handle any possible kind of changes, spreadsheets with many formulas and dependencies are somewhat problematic. Let's have a look at the following example:
|----------------------------|
|4711 | |
|----------------------------|
|42 |=SUM(A1:A2)|
|----------------------------|
Then we
1. Insert a row
2. Insert a column
3. Change 4711 to 4712
The result is
|---------------------------------|
|4712 | | |
|---------------------------------|
| | | |
|---------------------------------|
|42 | |=SUM(A1:A3)|
|---------------------------------|
The result in the current implementation is this (I omitted some style information):
<table:tracked-changes>
<table:insertion table:id="ct1" table:type="row" table:position="1" table:table="0"/>
<table:insertion table:id="ct2" table:type="column" table:position="1" table:table="0"/>
<table:cell-content-change table:id="ct3">
<table:cell-address table:column="0" table:row="0" table:table="0"/>
<table:previous>
<table:change-track-table-cell office:value-type="float" office:value="4711"/>
</table:previous>
</table:cell-content-change>
</table:tracked-changes>
<table:table>
<table:table-column/>
<table:table-column table:number-columns-repeated="2"/>
<table:table-row>
<table:table-cell office:value-type="float" office:value="4712">
<text:p>4712</text:p>
</table:table-cell>
<table:table-cell table:number-columns-repeated="2"/>
</table:table-row>
<table:table-row>
<table:table-cell table:number-columns-repeated="3"/>
</table:table-row>
<table:table-row>
<table:table-cell office:value-type="float" office:value="42">
<text:p>42</text:p>
</table:table-cell>
<table:table-cell/>
<table:table-cell table:formula="of:=SUM([.A1:.A3])" office:value-type="float" office:value="4754">
<text:p>4754</text:p>
</table:table-cell>
</table:table-row>
</table:table>
Please note that there is no CT markup in the table xml code. There's only a high-level description of what has happened table:tracked-changes section. This results in a lean xml code, on the other hand you need to know some application logic in order to undo the changes, i.e. the office:value in C3 has to be adjusted if you revert the third change.
Expressing this example using the generic ct proposal, the xml would look (somewhat) like this:
<table:table>
<table:table-column ac:change002="ct2,remove,table:number-columns-repeated,2"/>
<table:table-column delta:insertion-type="insert-with-content" delta:insertion-change-idref="ct2" table:number-columns-repeated="2"/>
<table:table-row>
<table:table-cell office:value-type="float" ac:change003="ct3,modify,office:value,4711" office:value="4712">
<delta:removed-content delta:removal-change-idref="ct3">
<text:p>4711</text:p>
</delta:removed-content>
<text:p delta:insertion-type="insert-with-content" delta:insertion-change-idref="ct3" >4712</text:p>
</table:table-cell>
<table:table-cell delta:insertion-type="insert-with-content" delta:insertion-change-idref="ct2"/>
<table:table-cell/>
</table:table-row>
<table:table-row delta:insertion-type="insert-with-content" delta:insertion-change-idref="ct1">
<table:table-cell ac:change002="ct2,modify,table:number-columns-repeated,2" table:number-columns-repeated="3"/>
</table:table-row>
<table:table-row>
<table:table-cell office:value-type="float" office:value="42">
<text:p>42</text:p>
</table:table-cell>
<table:table-cell delta:insertion-type="insert-with-content" delta:insertion-change-idref="ct2"/>
<table:table-cell table:formula="of:=SUM([.A1:.A3])" ac:change001="ct1,modify,table:formula,'of:=SUM([.A1:.A2])'" office:value-type="float"
ac:change003="ct3,modify,office:value,4753" office:value="4754">
<delta:removed-content delta:removal-change-idref="ct3">
<text:p>4753</text:p>
</delta:removed-content>
<text:p delta:insertion-type="insert-with-content" delta:insertion-change-idref="ct3" >4754</text:p>
</table:table-cell>
</table:table-row>
</table:table>
Any further changes made to the cell contents of A1 adds one attribute to A1 *and* to all depending cells, in this case C3. So in case of a large table with lots of dependencies this results in a bloated xml file (for 256 x 256 cells each depending on a single cell this means that each value change of this cell results in ~ 2MB of CT code only for the ac:change attributes). So from this point of view the current approach seems to be more efficient.
Any opinions?
Regards,
Frank
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