[ZPatterns] FAQ? Attributes in base ZClass required?

[Roché Compaan]

> When defining a rack, is it necessary to have all the attributes in
> the used ZClass defined? Or is it sufficient to have a dummy ZClass
> without any attributes?

We normally do define all attributes on the ZClass, even when using
a SQL RDBMS.  If don't think you can call manage_changeProperties on
the class if those properties are not defined.

Only computed attributes do not need to be defined on the ZClass.

Roché