Hi,
while fixing a problem I stumbled over a subtle problem with the
EXPORT_OASIS flag of the filter in xmloff for embedded objects.
The flag EXPORT_OASIS is not set when your filter exports to the OOo XML
format. This flag should not be used explicitly in the export code,
however in most filters it is, nonetheless. If you use it in the export
code, you might have a problem (like I had), otherwise you might stop
reading here.
When you write a binary file, the current document is exported as OOo
XML flat (!), which is passed to binfilter. The flat-filter has the
following problem:
The usual export code in xmloff only creates the OASIS format. To have
the OOo XML format, the OASIS format is transformed using the
transformer code (xmloff/source/transform). This is controlled by not
setting the EXPORT_OASIS flag. In flat format, the EXPORT_OASIS flag is
set for embedded objects, because if it wouldn't, the embedded object
would be transformed twice, once by the filter code of the embedded
object, and then again by the container, because the container
transforms the whole stream, including the embedded object. (That's what
flat means).
As a consequence, when you have:
1. An embedded object
2. That you export to binary format (or directly to flat OOo XML)
3. and you use something like "if( getExportFlags() & EXPORT_OASIS )" in
your export code,
you might get a problem, because although you export to OOo format, the
EXPORT_OASIS flag is set.
I admit, this is not a very common case, but it lead to problems in the
chart code (the most common embedded object), and may also appear in
other situation.
Sorry, for writing such long, confusing stuff here, just wanted to make
sure everybody knows about this.
Regards,
-Bjoern
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