SBO is currently made up of seven different vocabularies:
* systems description parameter (catalytic constant, thermodynamic temperature...)
* participant role (substrate, product, catalyst...)
* modelling framework (discrete, continuous...)
* mathematical expression (mass-action rate law, Hill-type rate law...)
* occurring entity representation (biochemical process, molecular or genetic interaction...)
* physical entity representation (transporter, physical compartment, observable...)
* metadata representation (annotation)