Hi Regina,
I did some digging into the source history hoping to find clues about
the original motivation for introducing this <table:table-columns> element.
Support for importing this element was added to Calc in 2000 along with
<table:table-header-columns>, as part of the initial work for freezing
rows and columns as headers in a spreadsheet.
Relevant commits are 7c9e9bfa for the export of headers, and 9cd39996
and 05c72064 for the import.
I suppose the idea was that two groups of columns would be used: the
header columns in a <table:table-header-columns> element followed by the
non-header columns in a <table:table-columns> element. However the
export was not actually updated to emit a <table:table-columns> element
like this, only the import support was added.
A couple of weeks later another similar element
<table:table-column-group> was added, for implementing the Outlines
feature described in help here:
https://help.libreoffice.org/Calc/Group_and_Outline
In this Outlines change (commit 869fb45a), all these three column
grouping elements were allowed to be nested inside each other. Prior to
that, the <table:table-columns> and <table:table-header-columns> could
only occur beneath the <table:table> element.
Anyway I think this background supports that the <table:table-columns>
element was not necessary from the beginning.
On 22/07/17 08:12, Regina Henschel wrote:
Luke Deller schrieb:
2. A database (odb) file can contain reports containing tables, which
will be emitted with <table:table-columns>.
I was not able to generate such document. I have tried it with report as
text document, report as spreadsheet and with the old kind of reports
from OOo2.4.3. I always have got only <table:table-column> elements.
Sorry perhaps I should call it a "report design" rather than a "report".
I created such a design using the "Use Wizard to Create Report" link
in the "Tasks" pane in Base.
Afterwards, in the Reports pane of Base, simply double clicking the
report gives me a Writer document, but if I right click on the report
and select "Edit", then I get a window entitled "Oracle Report Builder"
which allows the design to be edited. (BTW should we update this window
title?)
The report design was stored in a separate XML file within the odb file,
which was referenced in the content.xml like this:
<db:reports>
<db:component db:name="Customers" xlink:href="reports/Obj11"
xlink:type="simple" db:as-template="false"/>
</db:reports>
The <table:table-columns> element was located in the file
"reports/Obj11/content.xml" within the odb.
Regards,
Luke.
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