Created attachment 61123 [details]
test case, produced in 3.5.3
validation not passed on http://odf-validator.rhcloud.com/
used Writer 3.5.3 on Fedora 64 bit
changes-3-5-3.odt/styles.xml[109,707]: Error: unexpected attribute "style:layout-grid-snap-to-characters"
surprisingly this one actually is a duplicate
*** This bug has been marked as a duplicate of bug 44073 ***