LibreOffice Writer documents

Each content.xml is unchanged from an .odt file that a real LibreOffice Writer saved: LibreOffice 24.2.7.2 on Ubuntu 24.04, from soffice --headless --convert-to odt. An .odt file is a zip archive, and content.xml is the entry that holds the document's text; it declares 35 namespace prefixes on its root and names every element and attribute with one, as text:p and text:style-name.

before is a flyer with a Title paragraph Summer Bake Sale, a Subtitle paragraph Monday 17 November and a body paragraph. after is the same flyer once the date was changed to Monday 24 November, and nothing else. Tests zip each file into an .odt archive with its mimetype.