On 20/07/2012 Clarence GUO wrote:
Then how can I fix this defect? It seems the only way is to change the
standard and change the corresponding filter code. But I know change the
standard is not easy...

It is not easy, but not impossible either. See these resources where you can see that committers from this project already managed to extend ODF successfully:
https://wiki.oasis-open.org/office/Text_overline
http://www.robweir.com/blog/2008/04/suggesting-odf-enhancements.html
https://lists.oasis-open.org/archives/office-comment/200803/msg00000.html

If I recall correctly, in that case OpenOffice supported the enhancement before the official ODF specification did (I won't discuss here whether this is a good or a bad thing, but this is just to say that even if changing ODF is not easy, applications have implemented changes earlier than they were made official; and I may be wrong on this specific example).

Regards,
  Andrea.

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