The present disclosure involves systems, software, and computer implemented methods for identifying traits of an object. In one example, a set of traits is identified in an object-oriented system. A set of trait rules is identified. A trait data structure is generated. A set of classes in the object-oriented system is identified. For each class in the set of classes, a metadata structure is constructed. For each trait in the trait data structure, a trait rule in the trait computation rules structure is identified. The trait rule is applied to the particular metadata structure to generate a trait rule result. Whether the particular class has the particular trait is determined based on the trait rule result. In response to a determination that the particular class has the particular trait, the trait data structure is updated. The updated trait data structure indicates that the particular class has the particular trait.
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