Glycoside hydrolase releasing xylosyl residues from xyloglucan oligosaccharides at the non-reducing end. Has alpha-xylosidase activity against xylan oligosaccharides. Also has alpha-glucosidase activity against p-nitrophenyl-alpha-D-glucopyranoside. No activity against p-nitrophenyl-D-xyloside. Hydrolysis of terminal, non-reducing alpha-D-xylose residues with release of alpha-D-xylose. Expressed in roots, stems, leaves, flowers and siliques. Expressed in cell types undergoing cell wall modifications, including trichomes, vasculature, stomata, and elongating anther filaments. Not detected in pollen. Expressed at higher levels in younger, faster growing leaves than in older, slower growing leaves. No visible growth or morphological phenotypes, with the exception of shorter siliques. Loss of alpha-xylosidase activity and altered xyloglucan composition. Belongs to the glycosyl hydrolase 31 family.