First of all, I'm not sure if this is the right component. If not, please,
reassign it.

I accidentally found one issue, which forbids OpenOffice.org to open previously
saved file. This was done by my extension in this way ...

 - create TextTable, insert into Writer's document
 - get UserDefinedAttributes container, if there's no container, create new one
 - fill with AttributeData structures
 - set UserDefinedAttributes in TextTable

... I accidentally filled UserDefinedAttributes with one AttributeData( CDATA,
some string) with wrong name "table.column.%d.width" (without quotes). I just
forgot to format it. There was no exception, no error. I'm able to work with
this document.

But try to save this document. It works. No exception, no error. Close it and
try to reopen. OpenOffice.org dialog appears - Format error discovered in the
file in sub-document context.xml at ...

From my point of view - it's my fault. But from the user's point of view -
OpenOffice.org should display similiar warning during save, so user is informed
that the document was crippled by extension (or whatever).

In other words, OpenOffice.org knows that the saved file can't be reopened and
user is not warned.