Buckybase, a document database with bidirectional hyperlinks and reverse chronological access

I'm with Kragen Sitaker, when he writes:

Now I am feeling the need for a personal semistructured store more than
ever.  This is a searchable database that supports "data first,
structure later" <http://www.betaversion.org/~stefano/linotype/news/93/>
(i.e. you can add a schema incrementally to existing data entered
without one, or with a very primitive one), but supports enough
structure to render web pages and things like that.

Here's my design for a document database called Buckybase that fits that description.