Errr not exactly...
The funny thing... there's this company Informix that was sold to IBM around the turn of the century... which had this database IDS.
It was originally a relational database, but when Phil bought Illustra in '95, they got some cool object relational technology.
To net it all out... Its the only relational database which could be used to store unstructured/semi-structured data.
Of course had the orginal Arrowhead project been allowed to be completed... it would have been extremely scalable.
Just a footnote in history... even though IBM still sells IDS.
The problem was that nobody understood its potential, or how to sell it outside of a few.
Oh and one more tie in... Mike Olsen used to work for Stonebraker's Illustra and then Informix. ;-)