Howard (1987) gave some examples of schemata. First the schema of a human face. Like any schema, it consists of several parts or elements that are called 'varfiables' or 'slots'. The slots include lips, chin, nose, eyes, etc. The face schema prescribes that these parts be organised in a certain ways: the eyes are above the nose, the lips are below the nose and the chin is below the lips. If all of the parts are present but they are not arranged according to the prescribed way, the result would not be a face.
Another example is the schema of 'buy'. in an original form, it consists of several slots: a buyer, a seller, money (or some medium of exchange0 , and the item bought. These slots are arranged in a certain way. the buyer gives money to the seller, who then gives the item to the buyer. if these slots are arranged differently in a given situation, the the 'buy' schema doesn't apply to it. So, if a person A gives both money and an item to a person B and gets nothing in return, such an event would not be an example of buy. or if person A gives some items and gets nothing in return, the situation is an instance of 'give' or' rob' rather than' buy'.
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