I tried googling, but couldn't find any xslt file to transform ODF content xml to plain text. Maybe somebody knows if it exists?
Update:
The stylesheet I am searching for is intended to be used primarily with ODT content.xml. Here's example input: img.rg.ru/pril/article/61/45/53/UDO04.2012.odt (content.xml can be extracted with unzip). XSLT version is 1.0.