Why not just dump relational?

I mentioned MaVerick and OpenQM. And if you want "free" rather than "Free", there's always
UniVerse, UniData, jBase, and probably more.

For download links to UniVerse and UniData, go to www.u2ug.org. For jBase a web search should
find it.

As for the query language, SQL works, but you're probably better off using the tools provided
with the database. And while the MV query language may not have just one name, the different
dialects are about as similar as the different dialects of SQL.

Cheers,
Wol