text: Depending on whether the glycosidic bond lies "below" or "above" the plane of the cyclic sugar molecule, glycosides are classified as α-glycosides or β-glycosides. Some enzymes such as α-amylase can only hydrolyze α-linkages; others, such as emulsin, can only affect β-linkages.
  There are four type of linkages present between glycone and aglycone:
  * C-linkage/glycosidic bond, "nonhydrolysable by acids or enzymes"
  * O-linkage/glycosidic bond
  * N-linkage/glycosidic bond
  * S-linkage/glycosidic bond