Xylan 1,4-beta-xylosidase involved in the hydrolysis of xylan, a major structural heterogeneous polysaccharide found in plant biomass representing the second most abundant polysaccharide in the biosphere, after cellulose. Hydrolysis of (1->4)-beta-D-xylans, to remove successive D-xylose residues from the non-reducing termini. Optimum pH is 3.2. Optimum temperature is 60 degrees Celsius. Has a high thermal denaturation point. The Tmax of the protein was estimated to be 78.2 degrees Celsius. Glycan degradation; xylan degradation. Expression is under the control of the xylanolytic transcriptional activator xlnR and the repressor creA. Belongs to the glycosyl hydrolase 3 family.