Endo-1,4-beta-xylanase 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. Endohydrolysis of (1->4)-beta-D-xylosidic linkages in xylans. Glycan degradation; xylan degradation. Induced in presence of Zea mays leaves and by xylan, and repressed by glucose. SNF1 acts as a positive regulator through the release of glucose repression. Reduces the rate of xylan degradation and growth on minimal medium with xylan. Belongs to the glycosyl hydrolase 11 (cellulase G) family.