Reaction catalyzed by xylan 1,4-beta-xylosidase (3.2.1.37)

		+			=		p-nitrophenyl beta-(1-4)-D-xylooligosaccharide	+		H2O
	p-nitrophenyl beta-D-xylopyranoside	+		beta-D-xylopyranoside	=		p-nitrophenyl beta-(1-4)-D-xylooligosaccharide	+		H2O