objects or using indices.
Unlike many other OODBMS, there can be only one root in the storage. If you need to have several named roots, 
you should create <code>Index</code> object and use it as root object.<P>

Which classes are persistent capable depends on the particular language API.
In most of them they must be derived it from <code>Persistent</code> class.
This makes impossible to store "foreign" classes in the storage. This is the cost of easy use of DyBASE and lack of any specialized preprocessors o