| The Chicago Pizza Model |
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| <!ENTITY
% base “(deepDish | |
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| thinCrust
| stuffed)” > |
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| <!ENTITY
% topping “( pepperoni | |
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| mushrooms
| sausage | pepper | |
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| anchovies
| ...)” > |
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| <!ELEMENT
pizza - - |
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| ( %base;, tomatoSauce & cheese, |
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| %(topping)) > |
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| 14 |