Overloading array insertion?

I'm processing a XML with minOccurs and maxOccurs set frequently to either 0, 1, or unbounded. I have a schema describing this cardinality, together with the specific data type. I'd like to construct a (Delphi) class which keeps track of the cardinality, together with an array whose dimensions are to be validated based on the minOccurs and maxOccur fields. I believe using variants is a poor design choice, as I'll be fully aware of the data type before it's read (based on the XML schema rules).

I'm rather new to OOP in genera开发者_JAVA百科l, and Delphi OOP in particular, so what's my best options here? I've dreamt up something like:

TComplexType = class(TObject)
  FMinOccurs: integer;
  FMaxOccurs: integer;
  FValue:     Array of Variant;
public
  constructor Create(Min: integer; Max: integer);
  procedure AddValue(Value: variant);
  function Validate() : boolean;
end;

Of course, FValue may end up being a string, an integer, a double, etc. Thus, I believe I need to specialize:

TComplexString = class(TComplexType)
  FValue:     Array of string;
end;

Now, is the right way to go? Do I have to overload AddValue(Value: SomeType) in all the different classes (each class corresponding to a data type)? That doesn't seem very slick, as I'll be doing pretty much the same thing in every AddValue-method:

procedure AddValue(Value: SomeType);
begin;
  // 1) Re-shape array
  // 2) Add Value as the last (newly created) element in the array
end;

I'd really hate to do this for every type. (Admittedly, there won't be that many types, but I still consider it flawed design, as the logical content is pretty much identical in the overloaded methods.) Any good tips out there? Thanks!

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You didn't specify your Delphi version, but this is a classic example for generics (available in D2009 and higher).