public static ReferenceElementStrategy instance() {
        return INSTANCE;
    }
A strategy that detaches traversers with graph elements as references (i.e. without properties - just {@code id}
and {@code label}.

@author Stephen Mallette (http://stephen.genoprime.com)
gremlin-core/src/main/java/org/apache/tinkerpop/gremlin/process/traversal/strategy/finalization/ReferenceElementStrategy.java