public static T fromString(final String accessor) {
        if (accessor.equals(LABEL))
            return label;
        else if (accessor.equals(ID))
            return id;
        else if (accessor.equals(KEY))
            return key;
        else if (accessor.equals(VALUE))
            return value;
        else
            throw new IllegalArgumentException("The following token string is unknown: " + accessor);
    }
Value (representing Property.value())

@since 3.0.0-incubating
gremlin-core/src/main/java/org/apache/tinkerpop/gremlin/structure/T.java