Involved in degradation of plant cell wall polysaccharides. Is an acetyl esterase with broad substrate specificity, releasing acetic acid from acetylated xylo-oligosaccharides and acetylated xylan as well as xylose-tetraacetate, 4-O-methylumbelliferyl acetate, glucose-pentaacetate, and cephalosporin C. Appears to have greater activity on oligosaccharides than on polymeric substrates. Is also able to release acetic acid from xylo-oligosaccharides with 4-O-methylglucuronic acid side groups proximally located to O-acetyl esters. Preferentially targets xylo-oligosaccharides possessing three or more O-acetyl groups, but following their depletion it is active on the less acetylated portion of the substrate. Deacetylation of xylans and xylo-oligosaccharides. Optimum pH is 6.0 with glucose-pentaacetate as substrate. Active from pH 5.0 to 8.0. Optimum temperature is 30 to 35 degrees Celsius with glucose-pentaacetate as substrate. Active from 20 to 50 degrees Celsius. Still exhibits 40 to 70% of the maximum activity after 20 hours of incubation at 50 degrees Celsius. Glycan degradation; xylan degradation. Constitutively expressed. Belongs to the AB hydrolase superfamily.