The XML schema used by version 5.0 and greater of the Apache Software
Foundation Torque project(
http://db.apache.org/torque )
to model SQL database information.
This model restricts the available characters in java names and sql names
as compared to the standard database.xsd
Java identifiers, e.g. [A-Za-z_$]A-Za-z_$0-9]*
Java fully qualified names (e.g. x.y.x)
SQL Standard non-delimited identifiers.
SQL Standard non-delimited identifiers.