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User wanting to combine X with Y should be able to lookup on the web and download the adapter or 90% of the work predone.  It should be easy for users to share this information on the Web.

Connecting to other initiatives in world-type-modelling

Google, Bing, and Yahoo have standardized on microformats for semantic HTML web markup, and have a big schema defined (see http://schema.org/); some kind of integration that lets users easily make use of this information would be nice.  It would be nice to be able to use this without any download /copying, by referencing the (gradually evolving/changing) web site that specifies these things.  For instance, see the entry for "place" : http://schema.org/Place 

Judicious substitution of other packages for hand-built code

There's a plus and a minus for this - plus: we get better tested, better function (perhaps), better performance for some typical capabilities (e.g., parsing XML to/from Java Objects).  Minus - it make the code depend on these other packages. Also, if it's working fine now, there's little motivation to invest in changing it.

Some areas to consider:

• XML parsing and writing for descriptors - use JAXB or Jackson (already used for JSON support)