We use "certain" when specified is meant or when a more specific reference is possible. I have corrected this in other comments for some of the following but not all.

4.3.2.12 <meta:auto-reload>
5.4 <text:section>, 5.4.1 General
7.4.13 <text:sequence> Note
7.7.2 <text:placeholder>
8.1 Index Marks, 8.1.1 General
18.3.9 coordinate
19.404 presentation:node-type
19.882 text:time-adjust
20.172 draw:wrap-influence-on-position (2X)
20.257 style:flow-with-text
20.339 style:ruby-align
20.346 style:script-type
20.362 style:text-line-through-text

Proposal: Where not fixed elsewhere, reform to remove "certain."