Thanks for the response. What I am hoping to see is full integration of this developer documentation in Domino Designer Help and some sort of cooperation in how these plugins get upgraded in a Domino server software install program (which in the case of Domino 9 uses raw files on the server) versus the use of the NSF bases update site method.
To see the DDE help I am talking about, simply look under the topic "Building Eclipse components" or "composite applicationes" or search for "updatesite". All such documents are about Composite applications, not XPages or other OSGI apps like JDBC Access or REST data service. For that you have to look at Open NTF or buy a book. I do understand some things are still beta, and open source stuff always has a beta edge, but to move the product forward, it needs to be supported in the product help for Release 9.
The link you provided to Admin help is about Composite applications, as I mentioned. It is not about The Update Site features as used by the Extension Library and XPages type of stuff, and in fact uses different terminology. The 2 tribes need to be reconciled for the sake of your technical users.