A tag which creates and defines and creates a DynaClass
The DynaClass object is placed by name in the context,
so that a DynaBean tag can use it by name to instantiate
a DynaBean object
DynaProperty tag defines a property of a DynaClass
It can only exist inside a DynaClass parent context
The properties are added to the properties array
of the parent context, and will be used to
create the DynaClass object