[beta-D-Xylp-(1->4)-beta-D-Xylp-(1->4)-[alpha-L-Araf-(1->3)-beta-D-Xylp-(1->4)]-alpha-L-Araf-(1->3)-beta-D-Xylp-(1->4)]-beta-D-Xylp-(1->4)-D-Xyl(?->