Cleaves arabinose units from O-2- or O-3-monosubstituted xylose residues, thereby assisting in arabinoxylan (AX) and short-chain arabinoxylo-oligosaccharide (AXOS) degradation (By similarity). Preferres wheat flour xylan over oat spelt xylan as substrate. Does not display endoxylanase activity. Hydrolysis of terminal non-reducing alpha-L-arabinofuranoside residues in alpha-L-arabinosides. Activated by calcium and magnesium. Inhibited by copper. Optimum pH is 6.5. Optimum temperature is 55 degrees Celsius. Glycan degradation; xylan degradation. The C-terminal CBM6 domain shows calcium-dependent xylo-oligosaccharide and xylan binding. It binds, next to the structural calcium ion, a second calcium ion that, in addition to its coordination sites on the protein, completes its heptacoordination through coordination to the bound xylose moiety. Belongs to the glycosyl hydrolase 43 family.