Example to demonstrate inter model integration
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To run the demonstration:
(1) Run "make demo"

    This will first create the schemas (S1 and S2) for the sources 
    "undergraduates" and "graduates" and define the format representing 
    sources. Then the schemas are integrated and transformed to 
    the global relational schema. 

(2) Run "make queries"

    This will show examples of queries. 	

(3) Run "make gui"

    This will call the GUI editor. 
