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So how do we implement all this ...?

BLOCKS

Consider the use of LEGO blocks:

Blocks come in different types
Blocks have well defined hooks into which other blocks fit in
Blocks are of different colours and different shapes
Blocks from different LEGO sets can be hooked together if they have similar hooks
Blocks are used to construct complex shapes
Blocks are well defined entities

$\begin{figure} \centerline{ \psfig {file=figs/legoblocks.eps} }\end{figure}$

Omer F Rana
1/26/2002