Created attachment 85436 [details]
docx file with Textboxes which are not displayed

When a user opens a file she is not told if there are XML tags in the file which are not being recognised and she has no knowledge that data in the file is not being shown.

A simple example of this is opening a .docx file where the author has used the MS Word Textbox feature.  Textbox, and information contained within a Textbox, are not recognised by Writer and are either not displayed, or parts of the included text are displayed with other parts missing or displaced.

The user gets no warning that the data is not being displayed.

If the import process checked the XML tage against those which Writer recognises, an error message such as "Unknown XML tags in file - data may not be shown - do you with to continue" could be shown alerting the user to potential missing data.

See forum post https://forum.openoffice.org/en/forum/viewtopic.php?f=7&t=58829&hilit=+textbox#p259968 and https://forum.openoffice.org/en/forum/viewtopic.php?f=7&t=71775#p322645 which contains a good description and images of missing dats, extracts of the XML, and the .docx file (also attached here).

See bug reports 
https://bz.apache.org/ooo/show_bug.cgi?id=125627, https://bz.apache.org/ooo/show_bug.cgi?id=117910, https://bz.apache.org/ooo/show_bug.cgi?id=117980, https://bz.apache.org/ooo/show_bug.cgi?id=125579, https://bz.apache.org/ooo/show_bug.cgi?id=93842

THis also applies to other programs in the AOO suite but is particularly relevant to Writer and opening MS Office files, especially .docx files.