For many of the new features you have provided bibliographic links to help us understand the coding and its use. Could you provide a hint for propositional outlines?
We're working on this generally. We don't have documentation for the Propositional Outlines ready yet, though.
The only thing we currently have available is a glossary: Lexham Propositional Outlines Glossary.
I was a bit of a latecomer to this project, but a brief summary of the structuring might be that we started with the structuring in the Lexham Discourse Greek New Testament (or High Definition New Testament). In some cases, we made a more fine-grained breakdown of that structuring. The most substantive aspect of the propositional outlines was to add exegetically helpful labels to our structuring as opposed to things like "Sentence."
There will be more information on this in forthcoming documentation, but the labels come from a variety of sources. For example, on my own shelf, some of them reflect coherence relations I've seen in A Cognitive Exploration of Language and Linguistics (eds. Dirven and Verspoor). Others are similar to those found in Guthrie and Duvall's Biblical Greek Exegesis. Labels like "Topic" actually parallel the usage in the Lexham Discourse products.
Thank you very much - it gives me a good place to start