We've now published the source code for 2 of our 3 authoring AddIns on GitHub:
https://github.com/plutext/OpenDoPE-Mapping-WordAddIn is the most commonly used addin, similar to Word 2013's XML Mapping Pane, but with support for OpenDoPE content controls, including binding:
* conditions
* repeats
* pictures (including as rich text, for more positioning flexibility)
* Flat OPC XML
* XHTML
https://github.com/plutext/OpenDoPE-NoXML-WordAddIn uses a simple fixed ...