Binds to and hydrolyzes insoluble and soluble xylan substrates. Endohydrolysis of (1->4)-beta-D-xylosidic linkages in xylans. Glycan degradation; xylan degradation. Confined to immature xylems. Observed in maturing tracheary elements (TE) in the root maturation zone. The GH10 domain binds to xylan. Belongs to the glycosyl hydrolase 10 (cellulase F) family.