An ExtensionModule is a collection of optional data that may be used to extend the core WellFormedEntry model.

Extension modules have a UniqueIdentifier and a DefinedDataModel. AnswerMe: PLEASE HELP DEFINE THESE.

+1. What is the SyntaxExtensionMechanism?

So far, as per WellFormedEntryModel, we have the following ExtensionModules:
See the automatic list at CategoryExtension

Is this still part of the (future) standard?

I think extension modules of some sort are key. For instance, in the context of wikis, we'd like to extend the feed format to add things like the importance (major/minor) of each change. This has already been done with RSS (see RssForWikis).

-- BayleShanks

CategoryArchitecture, CategoryModel, ComponentBlog