metakit: Metakit (An embedded database library with a small footprint)
metakit:
metakit: It fills the gap between flat-file, relational, object-oriented,  and
metakit: tree - structured    databases,    supporting    relational     joins
metakit: serialization, nested structures, and instant schema evolution. There
metakit: is a C++ API, a Python binding called Mk4py, and a Tcl binding called
metakit: Mk4tcl  (with an optional  OO  binding on  top  called Oomk). You can
metakit: manipulate and exchange data between any of these.
metakit:
metakit:
metakit: