A new native XML database
engine, available as a technology preview download, has been created by
German company data ex machina.
Natix's developers report that their engine can be mounted in much the same
way as a normal filesystem, giving any application which can deal with regular
files the ability to import, export and query XML documents.
Natix requires Linux to run (kernel 2.2.16 or later, or 2.4.*), with CODA
support enabled in the kernel. A technology preview can be downloaded from
data ex machina's web site.