Query Rewriting Example

• View: get company info

v1:<C cview {<competitor V>}> :- <C company {<competitor V>}>

v2:<C bview {<buyout B>}> :- <C company {<buyout B>}>

• Find all my new potential competitors

<new_comp {<company X>}>:-

<B company {<competitor X>}> & <“myinc” company {<buyout B>}>

• Go to v2 to get myinc’s buyout targets
• Go to v1 to get their competitors

<new_comp {<company X>}>:- <“myinc” bview {<buyout B>}>@v1

& <B cview {<competitor X>}>@v2

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