public default Class<S> getTraversalCategory() {
        return (Class) TraversalStrategy.class;
    }
The type of traversal strategy -- i.e. {@link DecorationStrategy}, {@link OptimizationStrategy}, {@link FinalizationStrategy}, or {@link VerificationStrategy}.

@return the traversal strategy category class
gremlin-core/src/main/java/org/apache/tinkerpop/gremlin/process/traversal/TraversalStrategy.java