back to pre-relational days ?

"JE is nonrelational with only support for two column tables, while DB2
and Oracle store data within tables. In JE, you must build tables by
hand—using multiple B-trees. When databases are simple in nature, yet
large in size, JE is an excellent API to use for hand-rolling a database."

and here another quote about adding triggers to LDAP (doesn' ldap look
like a tree db ?)


"We're actually in the process of building an embeddable, pure-Java LDAP
server called Eve. She's a beaut, introducing triggers and stored
procedures to the world of LDAP."

http://www.eweek.com/article2/0,1759,1615407,00.asp