Where are config items like VerticalSplitPosition specified?

In spreadsheets (and presumably other file types, too), settings.xml has config-item elements like these:

<config:config-item-map-named config:name="Tables">
  <config:config-item-map-entry config:name="Sheet1">
    <config:config-item config:name="VerticalSplitMode" config:type="short">2</config:config-item>
    <config:config-item config:name="VerticalSplitPosition" config:type="int">3</config:config-item>
    <config:config-item config:name="ActiveSplitRange" config:type="short">0</config:config-item>

I’m trying to find out what the numbers in VerticalSplitMode and related items mean, but couldn’t find anything definitive in the official specs or elsewhere. Before I go burrowing through the source, are there any resources about LO settings and their values?

There is an old open issue in Bugzilla, so I thing that task has never been finished.

And an old blog post