What you've posted are examples of MSOffice ”compatibility settings” used to establish backwards compatibility with older documents, and, for the conversion of alien file formats (such as various versions of WordPerfect .wpd). These compatibility settings are unspecified in that we know the syntax but have no idea of the semantics. And without the semantic description there is no way other developers can understand implementation. This of course guarantees an unacceptable breakdown of interoperability.

But i would be hesitant to make my stand of rejecting OOXML based on this issue. It turns out that there are upwards of 150 unspecified compatibility settings used by OpenOffice/StarOffice. These settings are not specified in ODF, but will nevertheless show up in OpenOffice ODF documents – similarly defying interoperability efforts!

Since the compatibility settings are not specified or even mentioned in the ODF 1.0 – ISO 26300 specification, we have to go to the OOo source code to discover where this stuff comes from. Check out lines 169-211. Here you will find interesting settings such as, “UseFormerLineSpacing, UseFormerObjectPositioning, and UseFormerTextWrapping”.