A criterion is part of the definition of an {@link com.smartgwt.client.data.AdvancedCriteria} object, which is used to filter records according to search criteria.
Acriterion consists of an {@link com.smartgwt.client.data.Criterion#getOperator operator} and typically a {@link com.smartgwt.client.data.DataSourceField#getName fieldName} from a {@link com.smartgwt.client.data.Record} and a {@link com.smartgwt.client.data.Criterion#getValue value} to compare to. However some operators either don't require a value(eg, isNull) or act on other criteria rather than directly on a {@link com.smartgwt.client.data.Record}'s fields (eg, the "and" and "or" logical operators).
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