This class facilitates building frameworks of several classes that
inter-operate. It was first designed and built for "HTML::Mason", in
which the Compiler, Lexer, Interpreter, Resolver, Component, Buffer, and
several other objects must create each other transparently, passing the
appropriate parameters to the right class, possibly substituting other
subclasses for any of these objects.
The main features of "Class::Container" are:
* Explicit declaration of containment relationships (aggregation,
factory creation, etc.)
* Declaration of constructor parameters accepted by each member in a
class framework
* Transparent passing of constructor parameters to the class that
needs them
* Ability to create one (automatic) or many (manual) contained objects
automatically and transparently
