representing any obect in Schema

Hi friends,
I am working on XML Schema, where my problem is to embedd a vector into it. 
I found out that even you were working on the same problem. Did you found 
any way out.
I actually want to represent a hash table, which can take a numeric key, 
and a "data" object, and now the type of this "data" object can be anything 
- a int, float, string, array, 2d array, or just an object of any class 
with lots of member types.
Can you suggest any solution to this
Thanks and regards
Satinder



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